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: Unknown
[{'content': 'The “cutoff” value of plasma glucose in 50 g glucose challenge test is \nSelect and explain. \nA. 120 mg/dL, B. 140 mg/dL, C. 160 mg/dL, D. 180 mg/dL', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]