Which of the following diseases is transmitted by a carrier?

Options

A. Malaria
B. Hepatitis B
C. Chicken pox
D. Influenza

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which disease is transmitted by a carrier. A carrier is an organism that carries and transmits a disease-causing pathogen to another organism.

2. **Identifying the Diseases**: The options provided in the question include:
- Malaria
- Hepatitis B
- Chicken Pox
- Influenza

3. **Analyzing Each Disease**:
- **Malaria**: This disease is caused by the Plasmodium parasite, which is transmitted through the bite of a female Anopheles mosquito. The mosquito acts as a carrier for the Plasmodium.
- **Hepatitis B**: This is a sexually transmitted disease (STD) that spreads through direct contact with infected bodily fluids. It does not involve a carrier organism.
- **Chicken Pox**: This is caused by the varicella-zoster virus and spreads directly from person to person through respiratory droplets or contact with the rash. There is no carrier involved.
- **Influenza**: This is a viral infection that spreads through respiratory droplets when an infected person coughs or sneezes. It also does not involve a carrier.

4. **Conclusion**: Among the listed diseases, only malaria is transmitted by a carrier (the female Anopheles mosquito). Therefore, the answer is malaria.

**Final Answer**: Malaria

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