This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Measles is infective for: \nSelect and explain. \nA. One day before and 4 days after rash, B. Four days before and five days after rash, C. Entire incubation period, D. Only during scabs falling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Measles/English Measles is spread through respiration (contact with fluids from an infected person&;s nose and mouth, either directly or through aerosol transmission), and is highly contagious -- 90% of people without immunity sharing a house with an infected person will catch it. The infection has an average incubation period of 14 days (range 6-19 days) and Period of communicability in measles is approximately 4 days before and 5 days after the appearance of the rash. Measles is an infection of the respiratory system caused by a virus, specifically a paramyxovirus. REF : ananthanarayana 10th ed', 'role': 'assistant'}]