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': 'What are the symptoms of diabetes mellitus? \nSelect and explain. \nA. Polydipsia, B. Polyuria, C. Polyphagia, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]