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': 'Number of teeth seen on X-ray at birth: \nSelect and explain. \nA. 20, B. 22, C. 24, D. 30', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]