This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'FIGLU excretion test is to estimate deficiency of \nSelect and explain. \nA. Vitamin K, B. Vitamin B12, C. Vitamin folic acid, D. Niacin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]