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 line angle area is most acute when a permanent maxillary second molar is viewed occlusally? 
Select and explain. 
A. Mesiofacial, B. Distofacial, C. Mesiolingual, D. Distolingual
A: Mesiofacial
Answer: A: Mesiofacial 
Explanation: None