Select the tool-to-professional relation analogous to: “Sailor : Compass”.

Introduction / Context:
We seek a profession paired with a characteristic tool. A sailor commonly uses a compass for navigation. The best parallel is a doctor using a stethoscope for auscultation.

Given Data / Assumptions:
Tool → user is the relation, not place → person or object → owner.

Concept / Approach:
Check direction and specificity. “Doctor : Stethoscope” matches. “Student : Exam” is event participation; “Pen : Officer” reverses and mismatches; “Painter : Artist” is co-hyponym/profession, not tool; “Driver : Highway” is user → place, not tool.

Step-by-Step Solution:

Verification / Alternative check:
Medical basics confirm the stethoscope as a doctor’s diagnostic tool.

Why Other Options Are Wrong:
They break the required relation or reverse direction.

Common Pitfalls:
Choosing person–place or person–event relationships.

Final Answer:
Doctor : Stethoscope