This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Vitamin D is maximum in - \nSelect and explain. \nA. Milk, B. Fish fat, C. Eggs, D. Cod liver oil', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cod liver oil But overall Richest source is Halibut liver oil Ref: Park 25th edition Pgno : 653', 'role': 'assistant'}]