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: Medicine
[{'content': 'Energy yield of fats is \nSelect and explain. \nA. 4 kcal per gram, B. 6 kcal per gram, C. 8 kcal per gram, D. 9 kcal per gram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Carbohydrates and proteins -\xa04 kcal per gram.\nFats - 9\xa0kcal per gram.', 'role': 'assistant'}]