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: Biochemistry
[{'content': 'Not obtained from plant source ? \nSelect and explain. \nA. Cobalamine, B. Riboflavin, C. Thiamine, D. Vitamin A', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CobalamineVitamin B12 (cobalamin or cynocobalmin) is present only in food of animal origin. Other three vitamins can be taken from plant source.", 'role': 'assistant'}]