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: Social & Preventive Medicine
[{'content': 'A patient consumes strict vegetarian diet and does NOT take any animal product. He is going to suffer from deficiency of which vitamin: March 2013 (b, e) \nSelect and explain. \nA. B1, B. B3, C. B4, D. B12', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Vitamin B12 Vitamin B12 can be found in large quantities in animal products, including meat, poultry, fish, seafood, eggs, and dairy products; and the consumption of these products is the most longstanding method by which human beings have taken vitamin Buinto their systems.', 'role': 'assistant'}]