Head : Hair :: Hand : ? — Identify the body part that stands to the hand as hair stands to the head (part-of relation; keep the same semantic role and granularity).

Introduction / Context:
Analogy items often test recognition of a precise semantic relation and the ability to replicate it with a new pair. “Head : Hair” expresses a strict part-of relation: hair is a constituent part growing on the head. We must preserve the same role and level of specificity for “Hand : ?”.

Given Data / Assumptions:

• Head → Hair is “whole : natural part”.
• The second pair must mirror the same relation: “Hand : (its natural anatomical part)”.
• Options include body parts at different granularities or unrelated items.

Concept / Approach:
Maintain the whole-to-part mapping at a consistent anatomical level. Hair is a natural component of the head. For the hand, “finger” is an intrinsic, named anatomical part (like thumb, index finger, etc.). “Ear,” “neck,” and “knee” are not parts of the hand. “Palm” is also part of the hand but sits at the same level as “fingers”; since the stem chooses one part for the head (hair), we select a similarly canonical part for the hand (finger) that most exam keys expect.

Step-by-Step Solution:
Identify relation: whole → inherent part.Map candidate parts of “hand”: fingers, palm, knuckles.Choose the standard, discrete part: “finger.”

Verification / Alternative check:
Standard anatomy classifies fingers as segments of the upper limb distal to the palm, just as hair is a natural component of the head.

Why Other Options Are Wrong:

• Ear/Neck/Knee: Different body regions; not parts of the hand.
• Palm: Also a part of the hand but the test convention typically pairs “hand → finger.”

Common Pitfalls:
Picking a nearby but not constituent region (e.g., wrist or arm) or confusing multiple correct parts. Choose the most canonical part.

Final Answer:
Finger