Which is incorrectly matched?

    Disease                           Cause

1. Fluorosis                 Fluorides in water

2. Minamata               Mercury in fishing water

3. Chlorosis                 NO₂

4. Skin cancer            Ozone hole

The concept used: Chlorosis is not caused due to nitrogen dioxide. Detailed explanation: A shortage of chlorophyll causes chlorosis, which causes typically green leaves to become yellow. Chlorosis is caused by a variety of reasons, either separately or in combination. Thus, we can say that chlorosis is unrelated to nitrogen dioxide. It is incorrectly matched.