Race is to Fatigue as Fast is to which of the following effects or conditions?

Introduction / Context:
This analogy question connects an activity with a physical state that commonly results from that activity. A race often leads to fatigue, that is, tiredness. The second part of the analogy uses the word fast, which in this context means to abstain from eating. You must determine which condition most naturally results from fasting.

Given Data / Assumptions:
1) Race is a strenuous physical activity, especially a competitive running event.
2) Fatigue is the state of being tired or exhausted, often after heavy exertion.
3) Fast here refers to going without food for a period of time, as in religious or health related fasting.
4) The options are Hunger, Appetite, Weakness, and Food.
5) The relationship should be cause and effect in both parts of the analogy.

Concept / Approach:
In the first pair, taking part in a race causes fatigue as a natural consequence of physical exertion. In the second pair, fasting, that is not eating for a period, leads most directly to hunger, the feeling of needing or wanting food. While weakness can occur after longer or more intense fasting, hunger is the more immediate and direct effect. Therefore, the correct parallel effect for fast is hunger.

Step-by-Step Solution:
Step 1: Understand the first relationship. When a person runs a race, they often end up feeling fatigue due to heavy physical effort. Step 2: Recognise this as a cause effect pattern: race causes fatigue. Step 3: Interpret fast correctly. In this question, fast is a verb or noun meaning to abstain from food for some time, not fast as in quick. Step 4: Consider the immediate physical effect of not eating. A person who fasts soon feels hunger, the strong desire to eat. Step 5: Compare the options. Hunger is the direct feeling produced by lack of food. Appetite is the general desire for food but is not always caused specifically by fasting. Step 6: Weakness may appear after longer fasting but is a more distant effect and not the most immediate and universal one. Step 7: Food is not a condition at all but the thing that is absent during fasting. Step 8: Therefore, fast causes hunger just as race causes fatigue.

Verification / Alternative check:
Rephrase the analogy. Running a race leads to fatigue. Observing a fast leads to hunger. Both sentences state a clear and common cause effect relationship that aligns with everyday experiences. No other option allows such a clean parallel. For example, saying fast leads to food would not make sense in terms of causation.

Why Other Options Are Wrong:
Appetite is a general desire for food that can exist even when a person is not fasting, such as at mealtimes in normal routine. Weakness is more severe and may depend on the length and conditions of the fast, so it is less universally immediate than hunger. Food is not a physical state but the item one consumes, so it cannot play the same role as fatigue in the first pair.

Common Pitfalls:
Learners sometimes confuse hunger and appetite or choose weakness because they associate fasting with extreme conditions. However, analogy questions usually expect you to pick the most direct, primary consequence. Just as running a race almost always leads to some fatigue, fasting naturally and quickly leads to hunger.

Final Answer:
The correct completion of the analogy is Fast is to Hunger as Race is to Fatigue. Therefore, the correct answer is Hunger.