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 is not a type of trait of the permanent maxillary second premolar? \nSelect and explain. \nA. Buccal view: narrow shoulders (margins of crown; mesio- and disto-occlusal angles)., B. Occlusal table outline: ovoid., C. Mesiomarginal groove interrupts mesial marginal ridge., D. Lingual view: buccal profile is not visible.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: No, or almost never does the mesial marginal developmental groove cross the mesial marginal ridge.', 'role': 'assistant'}]