In this question, we are given two lists - List-I and List-II. We need to match the agents with the corresponding diseases and select the correct answer using the given codes.

List-I contains the agents - Arsenic, Fluoride, Dust, and Noise. List-II contains the corresponding diseases - Fluorosis, Melanosis, Presbycusis, and Silicosis.

Looking at the options:

Option 1: A-3;B-1;C-1;D-4

This option suggests that Arsenic is matched with Presbycusis, Fluoride is matched with Fluorosis, Dust is matched with Fluorosis, and Noise is matched with Silicosis.

Option 2: A-3, B-4, C-1, D-2

This option suggests that Arsenic is matched with Presbycusis, Fluoride is matched with Silicosis, Dust is matched with Fluorosis, and Noise is matched with Melanosis.

Option 3: A-2, B-1, C-4, D-3

This option suggests that Arsenic is matched with Melanosis, Fluoride is matched with Fluorosis, Dust is matched