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': 'True about Diptheria -a) Caused by Gram negative bacillib) Incubation period 2-5 daysc) Chemoprophylaxis is done with rifampicind) Previously immunized asymptomatic household contact should receive booster dosee) Child recovered from illness- give active immunization \nSelect and explain. \nA. c, B. d, C. ab, D. bd', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]