Guava fruits are especially rich in which of the following vitamins, making them a popular choice for boosting immunity?

Introduction / Context:
Fruits and vegetables are important sources of vitamins and minerals in the human diet. Different fruits are known for being rich in specific vitamins. Guava is a common tropical fruit often recommended for improving immunity and preventing vitamin deficiency. Many general knowledge questions ask which vitamin guava is particularly rich in, to test awareness of basic nutrition.

Given Data / Assumptions:

• The food item in question is guava fruit.
• The options list vitamins A, B complex, C, and D.
• We assume standard nutritional information about common fruits.
• The question focuses on the vitamin present in especially high amounts in guava.

Concept / Approach:
Guava is well known for its very high vitamin C content, often higher than that of oranges. Vitamin C, also called ascorbic acid, is important for immune function, collagen synthesis, antioxidant protection, and wound healing. While guava may contain small amounts of other vitamins, vitamin C is the one for which it is most celebrated in nutrition guides. Vitamins A and D are fat soluble and are more prominently obtained from animal products and some other plant sources, while B complex vitamins are distributed across many foods.

Step-by-Step Solution:
Step 1: Recall that vitamin C rich fruits include citrus fruits like oranges and lemons, and also guava and amla. Step 2: Guava is often highlighted in lists of fruits with exceptionally high vitamin C content per 100 grams. Step 3: Vitamin A is associated with orange and yellow fruits and vegetables like carrots and mangoes, and vitamin D is mainly obtained from sunlight exposure and certain animal foods. Step 4: B complex vitamins are spread across many cereals, pulses, and animal products rather than being specifically associated with guava. Step 5: Therefore, the vitamin most strongly linked with guava is vitamin C.

Verification / Alternative check:
Nutrition tables show that 100 grams of guava can provide more than the daily recommended intake of vitamin C for an adult in many dietary guidelines. Health articles and textbooks frequently mention guava as a superior source of vitamin C and recommend it for boosting immunity and preventing scurvy, the classic disease of vitamin C deficiency. This repeated emphasis in nutritional literature confirms that vitamin C is the correct answer.

Why Other Options Are Wrong:
Vitamin A is present in some fruits and vegetables but guava is not typically singled out as a primary source of vitamin A; instead, it is best known for its vitamin C content. Vitamin B complex includes several vitamins such as B1, B2, B3, and B12, which are found in a wide variety of foods; guava does not stand out as the richest source of B complex, so option B is not the best answer. Vitamin D is synthesised in the skin under sunlight and is obtained from foods like fish, egg yolk, and fortified products, not primarily from guava, so option D is clearly incorrect.

Common Pitfalls:
Some students may think of citrus fruits only when they hear vitamin C and neglect guava, leading them to guess other vitamins. Others may be unsure because fruits generally contain several vitamins. To avoid confusion, remember specific pairings: citrus, guava, and amla with vitamin C; carrots and mangoes with vitamin A; and sunlight with vitamin D. When a question highlights guava and immunity, vitamin C should come to mind as the key nutrient.

Final Answer:
The correct choice is Vitamin C, because guava fruits are especially rich in vitamin C and are widely recommended for boosting immunity and preventing deficiency of this vitamin.