This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'Which vitamin deficiency causes methylmalonic aciduria? \nSelect and explain. \nA. Vitamin B1, B. Vitamin B12, C. Vitamin B6, D. Vitamin B5', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Vitamin B12 * Methylmalonyl-CoA is accumulated and excreted in urine as methylmalonic acid (methylmalonate) in vitamin B12 deficiency, i.e. methylmalonic aciduria.", 'role': 'assistant'}]