Polio is transmitted by

Options

A. Inoculation
B. Contamination
C. Contaminated blood transfusions
D. Mosquito bite

Answer

### Step-by-Step Solution

1. **Understand the Question**: The question asks about the transmission method of polio. We need to identify the correct option from the given choices.

2. **Evaluate the First Option - Inoculation**:
- Inoculation refers to the introduction of pathogens or antigens into the body to stimulate an immune response.
- It is not a method of transmission for polio. Instead, it is a method used in vaccinations.
- **Conclusion**: Inoculation is not the correct answer.

3. **Evaluate the Second Option - Contamination**:
- Contamination refers to the presence of harmful substances or pathogens in food or water.
- Polio is caused by the poliovirus, which is transmitted through contaminated food and water.
- **Conclusion**: Contamination is the correct answer.

4. **Evaluate the Third Option - Contaminated Blood Transfusion**:
- This option refers to the transmission of diseases through blood transfusions.
- Diseases like hepatitis B and HIV are transmitted this way, but polio is not.
- **Conclusion**: Contaminated blood transfusion is not the correct answer.

5. **Evaluate the Fourth Option - Mosquito Bite**:
- Mosquito bites are known for transmitting diseases like malaria, dengue, and Zika virus.
- Polio is not transmitted by mosquitoes.
- **Conclusion**: Mosquito bite is not the correct answer.

6. **Final Conclusion**: After evaluating all options, the correct answer to the question "Polio is transmitted by" is **contamination** (specifically through contaminated food and water).