This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Vitamin B12 is not found in - \nSelect and explain. \nA. Soyabean, B. Milk, C. Meat, D. Fish', 'role': 'user'}, {'content': "Answer: A \nExplanation: Vitamin B-12 is not found in foods of vegetable orgin.REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 620", 'role': 'assistant'}]