Material–object analogy: “Shoe : Leather :: __________ : __________” — select the pair matching “object : typical material.”

Introduction / Context:
The relation is “object : common material from which it is made or constructed.” Shoes are commonly made of leather; highways are commonly surfaced with asphalt.

Given Data / Assumptions:

• Shoe → Leather (material).
• Highway → Asphalt (surface material).

Concept / Approach:
Match object to characteristic building material, not to people, places, or accessories.

Why Other Options Are Wrong:

• Bus : Conductor / Medicine : Doctor → object/service matched to a person; wrong relation.
• Train : wagon → part/vehicle relation, not material.
• Book : Library → item/place relation.

Final Answer:
Highway : Asphalt