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': 'Term mottled enamel was given by \nSelect and explain. \nA. Murray, B. Mc Kay, C. Dean, D. Churchill', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]