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 is supplied from only animal source: \nSelect and explain. \nA. Vitamin C, B. Vitamin B7, C. Vitamin B12, D. Vitamin D', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Vitamin B12 Ref: Harrison's 19th ed. P 640* Vitamin B12 (Cobalamin) is synthesized solely by microorganisms.* In humans, the only source for humans is food of animal origin, e.g., meat, fish, and dairy products.* Vegetables, fruits, and other foods of nonanimal origin doesn't contain Vitamin B12 .* Daily requirements of vitamin Bp is about 1-3 pg. Body stores are of the order of 2-3 mg, sufficient for 3-4 years if supplies are completely cut off.", 'role': 'assistant'}]