Which of the following pairs is incorrectly matched?

Correct answer: (c) Vitamin A - Colour-blindness

Explanation

Vitamin A deficiency causes night blindness (nyctalopia), not colour-blindness, so this pair is wrongly matched.

Colour-blindness is a genetic (X-linked) defect of retinal cones, unrelated to diet.

Correct pairs: Thiamine – Beriberi, Ascorbic acid – Scurvy, Vitamin K – blood clotting.