Read the passage about personalised diets, genomics, and healthy eating, and then answer the comprehension question. According to the passage, what are the scientists described in the text doing in their labs and research centres around the world?

Introduction / Context:
This reading comprehension question is based on a passage about future food science, genomics, and personalised nutrition. The passage explains how scientists are working to match our genes with our taste preferences so that one day our favourite foods will also be the healthiest foods for us. The question asks what the scientists are actually doing, so the reader has to focus on the key activity described in the text.

Given Data / Assumptions:

• The passage talks about a revolution in how people eat.
• It explains that scientists are working in labs and research centres around the world.
• The scientists aim to match human genes with taste buds.
• The goal is to create personalised diets that fight disease and improve health.
• The question asks directly: what are scientists doing.

Concept / Approach:
For a detail based comprehension question, the correct approach is to locate the sentence or sentences in the passage that mention scientists and their work. Then, the reader should paraphrase that information and compare it with each option. The correct option has to preserve the central idea that scientists are racing to match genes and taste buds to create a perfect, personalised diet. Any option that adds unrelated aims, such as making people taller, or ignores the gene and diet connection, must be rejected.

Step-by-Step Solution:
Step 1: Recall or find the sentence in the passage that mentions scientists and their activity. Step 2: Note the precise description: scientists are racing to match our genes and our taste buds, creating the perfect diet for each of us. Step 3: Look at option a and see that it states racing in laboratories to match our genes with our taste buds in order to create the perfect diet, which closely reflects the passage. Step 4: Check option b, which talks about asking everyone to start strict dieting, but the passage does not mention this as the main action. Step 5: Check options c, d, and e, which talk about making people taller, replacing food with medicines, or only weighing obese people, none of which is supported by the passage.

Verification / Alternative check:
If we read the key segment of the passage again, we see that the description is very clear. The scientists are not mainly concerned with weight loss programs, height change, or replacing meals. They are trying to design a personalised diet that works with a person's genetic code. Option a is the only one that accurately summarises this activity. Good reading comprehension practice involves checking whether each option can be traced back word for word or idea for idea to a portion of the passage. Only option a passes this test.

Why Other Options Are Wrong:
Option b exaggerates the dieting aspect and ignores the gene based matching described in the text. Option c introduces height and body size, which are not mentioned in the context of what the scientists are doing. Option d talks about medicines replacing food, which is not part of the passage's description. Option e focuses on weighing obese people, which again is not the main work mentioned for scientists. All of these options add new ideas that are not supported by the passage, so they are incorrect.

Common Pitfalls:
A common mistake in comprehension questions is to select an option that sounds generally related to health or food but does not precisely match what the passage states. Sometimes students also choose options that reflect their own assumptions about what scientists might do, instead of what the text actually says. To avoid this, it is important to base the answer strictly on the given passage and not on outside knowledge or guesswork.

Final Answer:
According to the passage, scientists are racing in laboratories and research centres to match our genes with our taste buds in order to create the perfect diet for each person, so option a is correct.