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: Dental
[{'content': 'Nasal width/length ratio is: \nSelect and explain. \nA. 62.50%, B. 70%, C. 65%, D. 66%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nasal index is the ratio of nasal width to nasal height multiplied by 100.\xa0\nThe nose has been classified into three major groups based on the nasal parameters:\n\nLeptorrhine or fine nose (nasal index of 69.9 or less)\nMesorrhine or medium (nasal index of 70.0 – 84.9)\nPlatyrrhine or broad nose (nasal index of 85.0 or more)', 'role': 'assistant'}]