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': 'Shoe leather survey was carried out by \nSelect and explain. \nA. McKay, B. Eager, C. Trendley Dean, D. Brown', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]