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': 'Normal nasofrontal angle is: \nSelect and explain. \nA. 105, B. 134, C. 190, D. 125', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]