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': 'All of the following are sources of vitamin A except: \nSelect and explain. \nA. Egg, B. Milk, C. Sunflower seeds, D. Tomato', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Sunflower seeds", 'role': 'assistant'}]