Product–active substance analogy: “Cigarette : Tobacco” — select the option that mirrors the product→active substance relationship.

Introduction / Context:
The relation is between a consumer product and its primary psychoactive or defining substance. A cigarette contains tobacco; analogously, brewed coffee contains caffeine as its notable active compound.

Concept / Approach:
Map to a pair where the right-hand term is the characteristic active component of the left-hand consumable.

Why Other Options Are Wrong:

• Milk : Bottle → container, not a substance.
• Cigar : Filter → many cigars do not use filters; filter is not active substance.
• Shoes : Socks / Tea : Cup → accessory or container relations, not active substance.

Final Answer:
Coffee : Caffeine