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': 'In EPT most efficient site of testing for posterior is: \nSelect and explain. \nA. Cusp tip of the mesiobuccal cusp, B. Cusp tip of the mesiolingual cusp., C. Equal over all the cus tips., D. None.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: For incisors- incisal edge is the most efficient site.\nFor posteriors- mesiobuccal cus tip is the best site.', 'role': 'assistant'}]