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
Which of the following is not a type of trait of the permanent maxillary second premolar? 
Select and explain. 
A. 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.
C: Mesiomarginal groove interrupts mesial marginal ridge.
Answer: C: Mesiomarginal groove interrupts mesial marginal ridge. 
Explanation: No, or almost never does the mesial marginal developmental groove cross the mesial marginal ridge.