Otoconia are

Options

A. Nerve fibres
B. Ear stones
C. Sensory hair
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Understanding Otoconia**:
- Otoconia are small crystals found in the inner ear. They are primarily composed of calcium carbonate.

2. **Location of Otoconia**:
- These crystals are located in the saccule and utricle, which are parts of the vestibular system in the inner ear.

3. **Common Name**:
- Otoconia are commonly referred to as "ear stones" or "ear rocks" due to their appearance and the fact that they can sometimes dislodge and fall into the inner ear.

4. **Evaluating the Options**:
- **Option A: Nerve fibers** - This is incorrect as otoconia are not nerve fibers.
- **Option B: Ear stones** - This is correct since otoconia are indeed referred to as ear stones.
- **Option C: Sensory hair** - This is incorrect as otoconia are not sensory hair cells.
- **Option D: None of the above** - This is incorrect because option B is correct.

5. **Conclusion**:
- The correct answer is **B: Ear stones**.