Which one of the following is a sexually transmitted disease?

Options

A. Typhoid
B. Tetanus
C. Leprosy
D. Hepatitis-B

Answer

To determine which of the following is a sexually transmitted disease (STD), we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Definition of STDs**:
- Sexually transmitted diseases are infections that are primarily spread through sexual contact. They can also be transmitted from mother to child during childbirth or breastfeeding.

2. **Evaluate Option 1: Typhoid**:
- Typhoid is caused by the bacterium *Salmonella typhi*. It is primarily transmitted through contaminated food and water, not through sexual contact.
- **Conclusion**: Typhoid is NOT an STD.

3. **Evaluate Option 2: Tetanus**:
- Tetanus is caused by the bacterium *Clostridium tetani*. It is typically contracted through wounds or cuts that become infected, not through sexual contact.
- **Conclusion**: Tetanus is NOT an STD.

4. **Evaluate Option 3: Leprosy**:
- Leprosy, also known as Hansen's disease, is caused by the bacterium *Mycobacterium leprae*. It is primarily spread through prolonged close contact with an infected person and is not classified as an STD.
- **Conclusion**: Leprosy is NOT an STD.

5. **Evaluate Option 4: Hepatitis B**:
- Hepatitis B is caused by the Hepatitis B virus (HBV). It is primarily transmitted through sexual contact, as well as through blood and other bodily fluids.
- **Conclusion**: Hepatitis B IS an STD.

6. **Final Answer**:
- Based on the evaluations, the sexually transmitted disease among the options provided is **Hepatitis B**.