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 of the following features of a permanent maxillary lateral incisor aids in distinguishing it from a mandibular lateral incisor? \nSelect and explain. \nA. Flattened root, B. More pronounced lingual fossa, C. Thinner incisal ridge, D. Sharper proximal incisal angles', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]