The causative agent of chancroid is

Options

A. HSV-1
B. HSV-2
C. HPV
D. Haemophilus ducrei

Answer

### Step-by-Step Solution

1. **Identify the Disease**: The question asks for the causative agent of chancroid, which is a sexually transmitted disease.

2. **Understand the Nature of the Disease**: Chancroid is a bacterial infection characterized by painful ulcers at the site of infection, typically affecting the external genitalia.

3. **Identify the Causative Agent**: The causative agent of chancroid is a specific bacterium. From the information provided, we learn that it is caused by *Haemophilus ducreyi*.

4. **Eliminate Incorrect Options**: The question may provide several options, including viruses such as HSV-1, HSV-2, and HPV. These are not related to chancroid:
- HSV-1 and HSV-2 are associated with herpes simplex virus infections.
- HPV is associated with genital warts.

5. **Conclude the Correct Answer**: Based on the information, the correct answer to the question is *Haemophilus ducreyi*.

### Final Answer
The causative agent of chancroid is *Haemophilus ducreyi*.

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