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': 'Three cusps arranged in triangle form: \nSelect and explain. \nA. Tritubercular stage, B. Triconodont, C. Buonodont, D. Polyphyodont', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In tritubercular stage 3 cusps are arranged in triangular\xa0form.', 'role': 'assistant'}]