Which one of the following disease causes dry, scaly lesions on skin, nails and scalp

Options

A. Ringworm
B. Skin allergy
C. Botulism
D. None of these

Answer

To answer the question about which disease causes dry, scaly lesions on the skin, nails, and scalp, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Symptoms**: The question specifies "dry, scaly lesions on skin, nails, and scalp." This is a key detail that helps narrow down the possible diseases.

2. **Consider the Options**: The options given are:
- A. Ringworm
- B. Skin allergy
- C. Botulism
- D. None of these

3. **Analyze Each Option**:
- **A. Ringworm**: This is a fungal infection caused by dermatophytes such as Trichophyton, Microsporum, and Epidermophyton. It typically leads to dry, scaly lesions on the skin, nails, and scalp.
- **B. Skin allergy**: This is usually an immune response (often involving IgE antibodies) that does not typically cause dry, scaly lesions but rather may cause redness, itching, or hives.
- **C. Botulism**: This is a serious illness caused by a toxin produced by the bacterium Clostridium botulinum. It primarily affects the nervous system and does not cause skin lesions.
- **D. None of these**: This option would only be correct if none of the other options fit the symptoms.

4. **Conclusion**: Based on the analysis, the disease that causes dry, scaly lesions on the skin, nails, and scalp is **Ringworm**.

### Final Answer:
**A. Ringworm**

---