Which of the following is a mismatch?

Options

A. AIDS - Bacterial infection
B. Polio - Viral infection
C. Malaria - Protozoan infection
D. Elephantiasis - Helminth infection

Explanation

To determine which of the following options is a mismatch, we need to analyze the diseases and their corresponding causative organisms.

1. **AIDS**:
- Causative organism: HIV (Human Immunodeficiency Virus)
- Type of infection: Viral infection
- **Match**: Correct (AIDS is a viral infection)

2. **Polio**:
- Causative organism: Polio virus
- Type of infection: Viral infection
- **Match**: Correct (Polio is a viral infection)

3. **Malaria**:
- Causative organism: Plasmodium (a protozoan)
- Type of infection: Protozoan infection
- **Match**: Correct (Malaria is a protozoan infection)

4. **Elephantiasis**:
- Causative organism: Wuchereria bancrofti (a helminth)
- Type of infection: Helminth infection
- **Match**: Correct (Elephantiasis is a helminth infection)

Now, let's summarize the matches:
- AIDS: Viral infection (Correct)
- Polio: Viral infection (Correct)
- Malaria: Protozoan infection (Correct)
- Elephantiasis: Helminth infection (Correct)

The only mismatch in the options given is:
- AIDS is incorrectly labeled as a bacterial infection.

Thus, the answer is that the mismatch is **AIDS - Bacterial infection**.