Find the odd human body reference (complete organ or appendage vs sub-part): Choose the item that is a sub-structure rather than a full organ or appendage.

Introduction / Context:
Human anatomy terms can be grouped by granularity. Whole organs or appendages contrast with their component sub-parts. Identifying which option denotes a component rather than a complete structure offers a clear odd-one-out criterion.

Given Data / Assumptions:

• Hands: complete appendages including palm, fingers, and associated bones and muscles.
• Ears: complete sensory organs for hearing and balance.
• Eyes: complete sensory organs for vision.
• Fingers: sub-parts of the hand, not independent organs or appendages.

Concept / Approach:
Group items by whether they denote a whole organ or appendage. Fingers are constituent parts of hands, while hands, ears, and eyes are complete structures with distinct functions.

Step-by-Step Solution:

Verification / Alternative check:
Consider medical specialization: hands, ears, and eyes commonly map to full-structure examinations; fingers are examined as components of the hand.

Why Other Options Are Wrong:
They represent complete organs or appendages with independent primary functions.

Common Pitfalls:
Pluralization is not the criterion; the structural level is.

Final Answer:
Fingers