Which one of the following is not correctly matched?

Correct answer: (d) Fluoride Ion - Indigestion

Explanation

Mercury poisoning causes Minamata disease, and Cadmium causes Itai-Itai disease.

Nitrate ions cause methemoglobinemia (Blue baby syndrome) in infants.

Fluoride excess causes fluorosis (mottled teeth, bone damage), not indigestion, so this pair is wrong.