Identify the organism which causes dry, scaly lesions on the skin, nails and scalp of human is

Options

A. A fungi belonging to genus Neurospora
B. A fungi belonging to genus Microsporum
C. A bacteria belonging to genus Streptococcus
D. A bacteria belonging to genus Mycobacterium

Answer

To solve the question of identifying the organism that causes dry, scaly lesions on the skin, nails, and scalp of humans, we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Symptoms**: The question specifies "dry, scaly lesions" on the skin, nails, and scalp. This description is commonly associated with certain fungal infections.

2. **Analyzing the Options**:
- **Option 1: Fungi belonging to genus Neurospora**: Neurospora is primarily known for its role in bread mold and does not typically cause skin lesions. Therefore, this option is incorrect.

- **Option 2: Fungi belonging to genus Microsporum**: This genus is known to cause dermatophyte infections, which can lead to dry, scaly lesions on the skin, nails, and scalp. This option is likely the correct answer.

- **Option 3: Bacteria belonging to genus Streptococcus**: Streptococcus is associated with various infections but does not cause dry, scaly lesions. This option is incorrect.

- **Option 4: Bacteria belonging to genus Mycobacterium**: Mycobacterium is known for causing diseases like tuberculosis and leprosy, but not for causing dry, scaly lesions on the skin. This option is also incorrect.

3. **Conclusion**: Based on the analysis of the options, the organism that causes dry, scaly lesions on the skin, nails, and scalp of humans is **Fungi belonging to genus Microsporum**.

### Final Answer:
The correct answer is **Option 2: Fungi belonging to genus Microsporum**.