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: Pathology
[{'content': 'Koplik spots \nSelect and explain. \nA. First manifestation of measles, B. Rarely seen in measles, C. Are seen 2-3 days after cutaneous rashes, D. Is first manifestation but seldom seen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]