Which vitamin acts as a coenzyme for the enzyme pyruvate dehydrogenase, and its deficiency can lead to beriberi?

A Vitamin B1 (Thiamine) ✓
B Vitamin B2 (Riboflavin)
C Vitamin B3 (Niacin)
D Vitamin B5 (Pantothenic acid)

Explanation

Thiamine (Vitamin B1) is a coenzyme for pyruvate dehydrogenase, an enzyme involved in glucose metabolism, and its deficiency can cause beriberi.

Source

Guyton and Hall Textbook of Medical Physiology
Vitamins Biochemistry Water-soluble vitamins Medium MEDICAL Confidence: high