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

A Vitamin B6 (Pyridoxine)
B Vitamin B9 (Folic acid)
C Vitamin B12 (Cobalamin) ✓
D Vitamin E (Tocopherol)

Explanation

Vitamin B12 serves as a cofactor for methionine synthase, an enzyme that converts homocysteine to methionine, playing a critical role in maintaining healthy homocysteine levels.

Source

Biochemistry by Stryer
Vitamins Biochemistry Amino Acid Metabolism Hard MEDICAL Confidence: high