This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Structure & Function of Proteins), Subject name: Biochemistry
[{'content': 'Cofactor involve in sulphur containing amino acid metabolism is? \nSelect and explain. \nA. Folic acid, B. Biotin, C. Vitamin B 1, D. Vitamin B 12', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: (D) Vitamin B 12REF: Lehninger Principles of Biochemistry 4tR edition page 674Sulphur conatining amino acids are methionine, cystine and cysteineVitamin B 12 is a co-factor for methionine synthetase; it helps to convert homocysteine to methionine', 'role': 'assistant'}]