Which of the following STD is not caused by a bacterium ?

Options

A. Chlamydia
B. Gonorrhoea
C. Syphilis
D. Genital Herpes

Answer

To determine which sexually transmitted disease (STD) is not caused by a bacterium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of STDs**:
- STDs can be categorized into two main types: bacterial STDs and viral STDs. Bacterial STDs are caused by bacteria, while viral STDs are caused by viruses.

2. **Identify Examples of Bacterial STDs**:
- Common examples of bacterial STDs include:
- Chlamydia
- Gonorrhea
- Syphilis

3. **Identify Examples of Viral STDs**:
- Common examples of viral STDs include:
- Genital herpes (caused by the herpes simplex virus)
- Human Immunodeficiency Virus (HIV)
- Genital warts (caused by human papillomavirus, HPV)
- Hepatitis B

4. **Analyze the Options Given**:
- If the question provides a list of STDs, we need to examine each option to see whether it is bacterial or viral.

5. **Select the Correct Answer**:
- Based on the examples provided, if one of the options is genital herpes, HIV, or hepatitis B, we can conclude that these are not caused by bacteria. For instance, genital herpes is caused by a virus.

6. **Conclude**:
- The correct answer to the question is the STD that is caused by a virus, which is not a bacterial STD.

### Final Answer:
The STD that is not caused by a bacterium is **genital herpes** (or any other viral STD mentioned in the options).