This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Whooping Cough (Pertussis), Subject name: Social & Preventive Medicine
[{'content': 'Post exposure prophylaxis is given in A/E \nSelect and explain. \nA. Rabies, B. Measles, C. Pertusis, D. Hepatitis B', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Pertussis Active immunoprophylaxis after exposure to disease is recommended for:RabiesTetanusHepatitisMeasles (within three days of exposure)*VaricellaMeasles vaccine can be given post exposure (within three days of exposure) because incubation period of measles is 7 days when the respiratory tract is bypassed (as with vaccine which is given subcutaneously) whereas normal incubation period is 10 days* from exposure to onset of fever (and 14 days to appearance of rash).", 'role': 'assistant'}]