Bone formed by ossification of tendon is 

Options

A. Sesamoid bone
B. Cartilage bone
C. Investing bone
D. Replacing Bone

Answer

### Step-by-Step Solution:

1. **Understanding Tendons**:
- Tendons are strong, fibrous connective tissues that connect muscles to bones. They are primarily made of collagen and are not elastic, meaning they do not stretch.

2. **Definition of Ossification**:
- Ossification is the process by which new bone is formed. This can occur in various ways, including the transformation of cartilage into bone or the conversion of other tissues into bone.

3. **Identifying the Type of Bone**:
- The question specifically asks about a type of bone that is formed through the ossification of tendon.

4. **Recognizing Sesamoid Bones**:
- Sesamoid bones are a specific type of bone that forms within tendons. They develop in response to stress and function to modify pressure and reduce friction between tendons and bones.

5. **Conclusion**:
- Therefore, the bone formed by the ossification of tendon is known as a **sesamoid bone**.

### Final Answer:
The bone formed by ossification of tendon is **sesamoid bone**.

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