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: Microbiology
[{'content': 'Patient presented with fever, coughing, headache. He developed rash on 3rd day, what is probable diagnosis ? \nSelect and explain. \nA. Measles, B. Mumps, C. Small pox, D. Chicken pox', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Measles Measles - Rash appears 3-4 days after onset of febrile illnessMumps - There is no rashSmall pox - Already eradicatedChicken pox - Rash appears on day 1 of febrile illness.", 'role': 'assistant'}]