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': 'Positive nitrogen balance is seen in \nSelect and explain. \nA. Malignancy, B. Pregnancy, C. Uncontrolled Diabetes mellitus, D. Burns', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]