This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Coenzyme for methylmalonyl-CoA isomerase 
Select and explain. 
A. Biotin, B. Cobalamine, C. Thiamine, D. Niacine
B: Cobalamine
Answer: B: Cobalamine 
Explanation: Methylmalonyl-CoA mutase is a vitamin B12- dependent enzyme, and in deficiency methylmalonic acid is excreted in the urine (methylmalonic aciduria).Ref: Harpers Illustrated Biochemistry, 30th edition, page no: 187