Incus bone is the modification `:-`

Options

A. Articular bone
B. Quadrate bone
C. Hyomandibular
D. Jugal bone

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the modification that leads to the formation of the Incus bone.

2. **Identifying Ear Ossicles**: The human ear contains three small bones known as ear ossicles: Malleus, Incus, and Stapes.

3. **Function of Ear Ossicles**: These bones play a crucial role in transmitting sound from the outer ear to the fluid-filled cochlea in the inner ear. Their absence can lead to hearing loss.

4. **Identifying the Origin of Ear Ossicles**: Each of the ear ossicles is derived from specific bones in ancestral species.
- Malleus is a modification of the Columella bone.
- Stapes is a modification of the Articular bone.
- Incus is a modification of the Quadrate bone.

5. **Conclusion**: Therefore, the Incus bone is specifically a modification of the Quadrate bone.

6. **Final Answer**: The Incus bone is the modification of the Quadrate bone.