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': 'Human races may be Dolichocephalic , when index is \nSelect and explain. \nA. 75 or less, B. 75-80, C. Above 80, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Dolichocephalic or long headed when the index is 75 or less.', 'role': 'assistant'}]