This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Infections, Subject name: Social & Preventive Medicine
[{'content': 'Period of infectivity for Measles is:- \nSelect and explain. \nA. 2 days before to 5 days after appearance of rash, B. 1 day before to 1 day after appearance of rash, C. 4 days before to 5 days after appearance of rash, D. Lifelong', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C. POX- 2 days before to 5 days after appearance of Rash. MEASLES- 4 days before to 5 days after appearance of Rash. RUBELLA- 7 days before symptoms to 7 days after appearance of Rash. MUMPS - 5-6 days before symptoms to 7 days after appearance of symptoms. INFLUENZA - 1-2 days before symptoms to 1-2 days after. DIPHTHERIA - 14-28 days from onset. POLIO - 7-10 days before symptoms to 7-10 after appearance of symptoms.', 'role': 'assistant'}]