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.

### Step-by-Step Solution:

1. **Understand the Definition of STDs**:
- Sexually transmitted diseases are infections that are primarily spread through sexual contact. They can be caused by bacteria, viruses, or parasites.

2. **Evaluate Each Option**:
- **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**: Not an STD.

- **Option 2: Tetanus**
- Tetanus is caused by the bacterium *Clostridium tetani*. It is not transmitted through sexual contact but rather through wounds or cuts that become infected.
- **Conclusion**: Not an STD.

- **Option 3: Leprosy**
- Leprosy is caused by the bacterium *Mycobacterium leprae*. It is not transmitted through sexual contact but through prolonged close contact with an infected person.
- **Conclusion**: Not an STD.

- **Option 4: Hepatitis B**
- Hepatitis B is caused by the Hepatitis B virus (HBV). It is transmitted through contact with infectious body fluids, including during sexual intercourse.
- **Conclusion**: This is an STD.

3. **Final Answer**:
- Based on the evaluations, the correct answer is **Hepatitis B**, as it is the only option that is a sexually transmitted disease.