This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Biochemistry
[{'content': 'vit B12 is found maximum in \nSelect and explain. \nA. Animal products, B. Green leafy vegetables, C. Roots and tubers, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : lipincott', 'role': 'assistant'}]