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': 'Transverse ridge is prominent on occlusal surface of which of the following deciduous teeth? \nSelect and explain. \nA. Mandibular first molar, B. Maxillary first molar, C. Mandibular second molar, D. Maxillary second molar', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]