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': 'In primates; a tooth with single conical cusp and\nsingle root is seen in: \nSelect and explain. \nA. Haplodont, B. Heterodont, C. Acrodont, D. Thecodont', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]