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': 'According to American diabetes association, HbAlc levels in diabetes patients under control are \nSelect and explain. \nA. 4-6mg/dl, B. <7mg/dl, C. 8mg/dl, D. >8gmd/dl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]