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': 'Microalbuminuria is defined as albumin \nSelect and explain. \nA. <30 microgms/24 hrs. urine collection, B. 30-300 microgms/24 hrs. urine collection, C. 300-550 microgms/24 hrs. urine collection, D. >550 microgms/24 hrs. urine collection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]