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': 'Micro albuminuria refers to urinary albumin excretion rate of - \nSelect and explain. \nA. 30-300mg/24 hour, B. 400-600 mg/24 hour, C. 700-900 mg/24 hour, D. >1000 mg/24 hour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]