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: Radiology
[{'content': 'The most commonly missing teeth are: \nSelect and explain. \nA. 3rd molars, B. Mandibular second premolar, C. Maxillary lateral incisor, D. Mandibular central incisor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most commonly missing teeth are third molars, followed by mandibular second premolars and maxillary lateral and mandibular central incisors.', 'role': 'assistant'}]