Pathogenecity of leprosy and tuberculosis is due to

Options

A. Wax D
B. Prostaglandins
C. Cholesterol
D. Ergasterol

Answer

### Step-by-Step Solution:

1. **Identify the Diseases**: Leprosy and tuberculosis are both diseases caused by bacteria. Leprosy is caused by *Mycobacterium leprae*, and tuberculosis is caused by *Mycobacterium tuberculosis*.

2. **Understand Pathogenicity**: Pathogenicity refers to the ability of an organism to cause disease. In the case of leprosy and tuberculosis, the pathogenicity is linked to specific components of the bacterial cell wall.

3. **Identify the Key Component**: The bacteria responsible for leprosy and tuberculosis have a unique component in their cell wall known as Wax D. This waxy substance is crucial for the bacteria's ability to evade the host's immune system and establish infection.

4. **Evaluate the Options**:
- **A. Wax D**: This is correct as it is the component responsible for the pathogenicity of leprosy and tuberculosis.
- **B. Prostaglandins**: Incorrect; these are signaling molecules and do not contribute to the pathogenicity of these diseases.
- **C. Cholesterol**: Incorrect; cholesterol is a type of lipid found in cell membranes but is not related to the pathogenicity of these bacteria.
- **D. Ergosterol**: Incorrect; ergosterol is a sterol found in fungal cell membranes and does not play a role in the pathogenicity of leprosy and tuberculosis.

5. **Conclusion**: The correct answer is **A. Wax D**, as it is the specific component that contributes to the pathogenicity of both leprosy and tuberculosis.