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': 'A pronounced developmental groove is usually present on the mesial marginal ridge of a permanent: \nSelect and explain. \nA. Mandibular third molar, B. Mandibular second premolar, C. Maxillary second molar, D. Maxillary first premolar', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]