Otolith is mainly composed of

Options

A. Lipid
B. Calcium carbonate
C. Mucopolysaccharide
D. Calcium phosphate

Answer

To answer the question "Otolith is mainly composed of," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Otolith**:
- Otolith, also known as "ear stones," is a structure found in the inner ear of vertebrates. The term "oto" refers to the ear, and "lith" means stone.

2. **Function of Otolith**:
- Otoliths play a crucial role in the vestibular system, which is responsible for balance and spatial orientation.

3. **Composition of Otolith**:
- The main component of otoliths is calcium carbonate. This substance forms the bulk of the otolith structure, providing the necessary density and weight for its function in balance.

4. **Evaluating Options**:
- Given the options:
1. Lipid
2. Calcium Carbonate
3. Nicopolysaccharide
4. Calcium Phosphate
- The correct answer is **Calcium Carbonate**, as it is the primary material that makes up otoliths.

5. **Conclusion**:
- Therefore, the answer to the question is that otolith is mainly composed of **Calcium Carbonate**.