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': 'A balanced diet consists of: \nSelect and explain. \nA. 20% proteins, 25% fats , 50% carbohydrates, B. 20% proteins, 35% fats , 45% carbohydrates, C. 25% proteins, 25% fats , 50% carbohydrates, D. 35% proteins , 15% fats , 50% carbohydrates', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]