Option 1: Minamata disease is caused by mercury poisoning. People become ill when they ingest seafood contaminated with methylmercury, leading to neurological symptoms.
Option 2: Itai-Itai disease is caused by cadmium toxicity. This disease occurs when people are exposed to high levels of cadmium through contaminated water, food, or air. It primarily affects the bones and kidneys, causing pain and fractures.
Option 3: Dermatitis is not caused by metal toxicity. It is a skin condition that can be triggered by various factors, such as allergens, irritants, and genetic predisposition.
Option 4: Both Minamata and Itai-Itai are caused by metal toxicity, so this option is incorrect.
In conclusion, the correct answer is option 3: Dermatitis. It is not caused by metal toxicity.