Find the odd anatomical item (organ/part vs tissue type): Identify the one that is not an external organ/part designation.

Introduction / Context:
Human anatomy terms can be split into named organs/body parts versus tissue types. Eye, ear, and hand denote specific organs/parts; “bone” denotes a tissue type and skeletal element category, not a single external organ label.

Given Data / Assumptions:

• Eye: sensory organ.
• Ear: sensory organ.
• Hand: articulated body part (multiple bones, muscles, tendons).
• Bone: tissue category/structural element, present throughout the skeleton, not an external organ name by itself.

Concept / Approach:
Use naming specificity: three items are discrete parts commonly referred to as organs/body parts. “Bone” is a material/tissue found in many parts, not a single part name.

Step-by-Step Solution:

Verification / Alternative check:
Ask: “Which part hurts?” → eye/ear/hand are parts; “bone” needs specification (e.g., femur, radius).

Why Other Options Are Wrong:
They point to distinct external organs/parts.

Common Pitfalls:
Hand contains bones, but the label “bone” is not a specific part name.

Final Answer:
Bone