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': 'Cusp of carabelli is present on \nSelect and explain. \nA. Permanent Maxillary 1st Molar, B. Permanent Mandibular 1st Molar, C. Permanent Maxillary 2nd Molar, D. Permanent Mandibular 2nd Molar', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]