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': 'Distobuccal cusp of 27 falls into: \nSelect and explain. \nA. Embrasure of 37 & 38, B. Embrasure of 36 & 37, C. Mesial pit of 37, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]