Which one of the following pair is not correctly matched ?

Options

A. NEERI - Nagpur
B. Byssinosis - Lung fibrosis dur to iron particles
C. Hay fever - Skin allergy and asthma
D. Photochemical smog - Inhibits ETS

Answer

To determine which pair is not correctly matched, let's analyze each option provided in the question:

1. **Nehri, Nagpur**:
- Nehri stands for the National Environment Engineering Research Institute, which is indeed located in Nagpur. This is a correct match.

2. **Bysnosis, Lung fibrosis due to iron particle**:
- Bysnosis is a rare lung disease, but it is primarily caused by the inhalation of textile fibers such as hemp, flax, or cotton, not iron particles. Therefore, this is an incorrect match.

3. **Hay fever, skin allergy and asthma**:
- Hay fever is associated with allergic reactions and can lead to asthma in some individuals. This is a correct match.

4. **Photochemical smog, inhibits the ETS (electron transport system)**:
- Photochemical smog is indeed harmful and can affect the electron transport system in mitochondria, leading to energy production issues. This is also a correct match.

Based on this analysis, the pair that is not correctly matched is **Bysnosis, Lung fibrosis due to iron particle**.

### Step-by-Step Solution:
1. Identify the pairs given in the question.
2. Analyze each pair to check for correctness.
3. Confirm that Nehri is correctly matched with Nagpur.
4. Determine that Bysnosis is incorrectly matched with lung fibrosis due to iron particles.
5. Verify that hay fever is correctly associated with skin allergy and asthma.
6. Conclude that photochemical smog correctly inhibits the electron transport system.

### Final Answer:
The pair that is not correctly matched is **Bysnosis, Lung fibrosis due to iron particle**.