Select the correct statement :

Options

A. Particulate matter of size `10 mu `m can cause severe damage to the lungs
B. Particulate matter of size greater than `2.5 mu m` can get trapped in the lungs and cause problems
C. Particulate matter size less than `2.5 mu m` penetrate deep into the lungs
D. None of the above

Answer

To solve the question of selecting the correct statement regarding particulate matter and its effects on the lungs, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The first statement claims that particulate matter of size 10 micrometers can cause severe damage to the lungs.
- **Evaluation**: This statement is incorrect. Particulate matter larger than 10 micrometers is typically filtered out by the upper respiratory tract and does not penetrate deeply into the lungs. It is the smaller particles, particularly those less than 10 micrometers, that can cause significant lung damage.

2. **Analyze the Second Statement**:
- The second statement suggests that particulate matter greater than 2.5 micrometers can get trapped in the lungs and cause problems.
- **Evaluation**: This statement is also incorrect. Particulate matter that is less than 2.5 micrometers is the one that can penetrate deeper into the lungs and cause health issues. Larger particles are generally trapped in the upper respiratory system.

3. **Analyze the Third Statement**:
- The third statement asserts that particulate matter less than 2.5 micrometers can penetrate deep into the lungs.
- **Evaluation**: This statement is correct. Particulate matter of this size can bypass the body's natural defenses and reach the alveoli, leading to respiratory problems and other health issues.

4. **Analyze the Fourth Statement**:
- The fourth statement states that none of the above options are correct.
- **Evaluation**: Since we have identified that the third statement is correct, this option is also incorrect.

### Conclusion:
The correct answer is **Option 3**: "Particulate matter size less than 2.5 micrometers penetrate deep into the lungs."