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': 'Which line angle area is most acute when a permanent maxillary second molar is viewed occlusally? \nSelect and explain. \nA. Mesiofacial, B. Distofacial, C. Mesiolingual, D. Distolingual', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]