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: Pathology
[{'content': 'Most common missing tooth in the permanent dentition is: \nSelect and explain. \nA. Maxillary canine, B. Maxillary first molar, C. Mandibular second premolar, D. Mandibular first molar', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]