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: Pediatrics
[{'content': 'True about measles – \nSelect and explain. \nA. Koplik spot appears in prodromal stage, B. Fever stops after onset of rash, C. Vaccine given at 9 month, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Measles vaccine is given at the age of 9 months of age.', 'role': 'assistant'}]