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': 'Average of length of maxillary cuspid is: \nSelect and explain. \nA. 26 mm, B. 33 mm, C. 21 mm, D. 18 mm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]