Fungi causing hair loss are

Options

A. Keratophilous
B. Pyrophilous
C. Coprophilous
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about fungi that cause hair loss. We need to identify which of the given options is responsible for this condition.

2. **Analyzing the Options**:
- **Option A: Chiratophilus**: This fungus is known to grow on keratin-rich substrates such as feathers, hair, and nails. Since it grows on hair, it can lead to hair loss.
- **Option B: Pyrophilus**: This fungus grows on burnt or fired substrates. It does not have any association with hair or hair loss.
- **Option C: Coprophilus**: This fungus grows on animal dung. It is not related to hair or hair loss.
- **Option D: None of the above**: This option implies that none of the fungi listed cause hair loss.

3. **Identifying the Correct Answer**: Based on the analysis:
- Chiratophilus is the only fungus that grows on hair and can cause hair loss. Therefore, it is the correct answer.

4. **Conclusion**: The fungi causing hair loss are **Chiratophilus**.