Which of these is a STD ?

Options

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

Answer

To determine which of the given options is a sexually transmitted disease (STD), we will analyze each option one by one.

### Step-by-Step Solution:

1. **Examine Typhoid:**
- Typhoid is caused by the bacterium *Salmonella typhi*.
- It is primarily transmitted through contaminated food and water.
- Since it is not transmitted through sexual contact, **typhoid is not an STD**.

2. **Examine Tetanus:**
- Tetanus is caused by the bacterium *Clostridium tetani*.
- It is transmitted through breaks in the skin, usually from contaminated objects.
- As it does not involve sexual transmission, **tetanus is not an STD**.

3. **Examine Leprosy:**
- Leprosy is caused by the bacterium *Mycobacterium leprae*.
- It is spread through close contact with an infected person.
- There is no evidence of sexual transmission, so **leprosy is not an STD**.

4. **Examine Hepatitis B:**
- Hepatitis B is caused by the hepatitis B virus.
- It can be transmitted through contact with infected bodily fluids, including blood and semen.
- Sexual intercourse is one of the ways this virus can be spread, making **hepatitis B an STD**.

### Conclusion:
The only option that qualifies as a sexually transmitted disease is **hepatitis B**.

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