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': 'How many cusps does the crown of the maxillary first primary molar have? \nSelect and explain. \nA. 2, B. 3, C. 4, D. 5', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]