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: Social & Preventive Medicine
[{'content': 'Koplik spots are seen in: March 2013 \nSelect and explain. \nA. Mumps, B. Influenza, C. Rubella, D. Measles', 'role': 'user'}, {'content': "Answer: D \nExplanation: D i.e. Measles Koplik spots They are a prodromic viral enanthem of measles manifesting two days before the measles rash itself. They are characterized as clustered, white lesions on the buccal mucosa near each Stensen's duct (on the buccal mucosa opposite the maxillary 2nd molars) and are pathognomonic for measles.", 'role': 'assistant'}]