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': 'A negative nitrogen balance is observed \nSelect and explain. \nA. During normal pregnancy, B. during convalescence, C. In malnutrition, D. During normal child growth', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]