Analogy — Disease : Medicine :: Famine : ? Select the option that stands to “famine” the way “medicine” stands to “disease” (i.e., a typical remedy or alleviating factor).

Introduction / Context:
The pair “Disease : Medicine” expresses a remedy–problem relationship in which the second term (medicine) commonly treats or alleviates the first (disease). To preserve the same logic, we need an option that typically alleviates or resolves the condition of a famine.

Given Data / Assumptions:

• Disease is commonly treated with medicine (remedy relationship).
• Famine is a prolonged scarcity of food, often linked to crop failure and lack of rain.
• The correct choice should be a standard alleviator or remedy for famine conditions.

Concept / Approach:
Map the relation as “problem → remedy.” Check which alternative is a conventional mitigator of famine. Avoid causes of famine or items only indirectly related. Prioritize the factor that directly enables food production to resume at scale.

Step-by-Step Solution:

Verification / Alternative check:
Historically and in agronomy, timely and adequate rainfall restores crop yields and food supply, directly addressing famine drivers such as failed monsoons or prolonged dry spells.

Why Other Options Are Wrong:

• Clouds — do not guarantee precipitation; insufficient as a remedy.
• Drought — a principal cause of famine, not a solution.
• River — can aid irrigation regionally but lacks the widespread corrective effect of rainfall.

Common Pitfalls:
Confusing a cause (drought) or an associated phenomenon (clouds) with an actual remedy. The analogy demands the counterpart that resolves the condition.

Final Answer:
Rainfall