Mark the odd one out.

Options

A. Scaphoid
B. Lunate
C. Pisiform
D. Calcaneum

Answer

### Step-by-Step Solution:

1. **Identify the Bones**: The question asks to mark the odd one out among a list of bones. We need to first identify the bones provided in the question.

2. **Classify the Bones**: The bones mentioned include:
- Humerus
- Ulna
- Radius
- Carpals (8 bones)
- Metacarpals (5 bones)
- Phalanges (13 bones)

3. **Focus on Carpals**: The transcript mentions that the focus is on the carpals, which are a group of bones in the wrist. The specific carpals mentioned are:
- Scaphoid
- Lunate
- Triquetrum
- Pisiform
- Trapezium
- Trapezoid
- Capitate
- Hamate

4. **Identify the Odd Bone**: The transcript indicates that the odd one out is the calcaneum. The calcaneum is the heel bone located in the hind limb, while the other bones mentioned (scaphoid, lunate, pisiform, etc.) are all part of the wrist (carpals).

5. **Conclusion**: Therefore, the odd one out is the **calcaneum** because it belongs to a different limb (hind limb) compared to the others which are part of the forelimb.

### Final Answer:
The odd one out is **calcaneum**.

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