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 deficiency is seen in vegetarians especially - \nSelect and explain. \nA. Vitamin B12, B. Vitamin B6, C. Vitamin B3, D. Vitamin B2', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Vitamin B12* Dietary sources of vitamin B12 are of animal origin only and include meat, eggs, milk, diary products, fish, poultry etc. Vitamin B12 is absent in plant foods. Small amount of vitamin B12 is synthesized in the intestine by the action of intestinal flora.", 'role': 'assistant'}]