Which vitamin acts as a coenzyme for the enzyme methionine synthase, involved in the conversion of homocysteine to methionine?

A Vitamin B6
B Vitamin B9
C Vitamin B12 ✓
D Vitamin C

Explanation

Vitamin B12 is a coenzyme for methionine synthase, which converts homocysteine to methionine.

Source

Biochemistry journals
Vitamins Biochemistry Water-soluble vitamins Medium MEDICAL Confidence: high