A common childhood disease is:

Options

A. Dengue fever
B. Plague
C. Whooping cough
D. Botulism

Answer

### Step-by-Step Solution:

1. **Identify the Options**: The question presents four options for common childhood diseases: Dengue fever, plague, whooping cough, and botulism.

2. **Analyze Dengue Fever**:
- Dengue fever is caused by the dengue virus and is transmitted through mosquito bites, specifically from the Aedes mosquito.
- It is noted that dengue fever is rarely seen in children due to their developing immunity, especially after the age of 8-10 years.
- Conclusion: Dengue fever is not a common childhood disease.

3. **Analyze Plague**:
- Plague is caused by the bacterium Yersinia pestis and is typically spread through contact with infected animals or their fleas.
- It is mentioned that plague is also rarely seen in children.
- Conclusion: Plague is not a common childhood disease.

4. **Analyze Whooping Cough**:
- Whooping cough is caused by the bacterium Bordetella pertussis and is transmitted through the air.
- This disease is prevalent in children because they often lack the necessary immunization and immunity to fight off the infection.
- Symptoms include severe coughing fits that can lead to breathing difficulties.
- Conclusion: Whooping cough is a common childhood disease.

5. **Analyze Botulism**:
- Botulism is caused by the bacterium Clostridium botulinum and involves the production of a potent toxin.
- It is primarily associated with contaminated food and is considered rare.
- Conclusion: Botulism is not a common childhood disease.

6. **Final Conclusion**: After analyzing all the options, the only common childhood disease among the given options is **whooping cough**.

### Final Answer:
The common childhood disease is **whooping cough**.

---