P is one of the most dangerous air pollutants. It combines with haemoglobin of blood and prevents it from carrying oxygen. P could be ______

Options

A. CFC
B. Sulphur dioxide
C. Carbon monoxide
D. Particulate matter

Answer

To solve the question, we need to identify the air pollutant "P" that combines with hemoglobin in the blood and prevents it from carrying oxygen. Let's break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding Hemoglobin Function**:
- Hemoglobin is a protein found in red blood cells (RBCs) that is responsible for transporting oxygen from the lungs to the rest of the body.

**Hint**: Remember that hemoglobin's primary role is to carry oxygen.

2. **Identifying the Pollutant**:
- The question states that "P" is a dangerous air pollutant that interferes with hemoglobin's ability to carry oxygen.

**Hint**: Think about common air pollutants and their effects on health.

3. **Evaluating the Options**:
- The options provided include various pollutants. We need to analyze each one:
- **CFCs**: Known for depleting the ozone layer but do not interact with hemoglobin.
- **Sulfur Dioxide**: Mainly causes acid rain and does not bind with hemoglobin.
- **Carbon Monoxide (CO)**: This is a colorless, odorless gas that binds with hemoglobin more effectively than oxygen does, thereby reducing the blood's ability to carry oxygen.

**Hint**: Focus on the pollutant that competes with oxygen for binding sites on hemoglobin.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Carbon Monoxide (CO)**, as it binds with hemoglobin and prevents it from carrying oxygen.

**Final Answer**: P could be **Carbon Monoxide (CO)**.