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: Pediatrics
[{'content': 'Incubation period of pertussis is – \nSelect and explain. \nA. 7 days, B. 7–14 days, C. 14–28 days, D. 28 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pertussis \nAfter an incubation period of about 1-2 weeks, the disease takes a protracted course comprising three stages, - the catarrhal, paroxysmal and Convalescent - each lasting approximately two weeks.\n\nB. pertussis infection\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 ↓\nIncubation period (1-2 weeks)\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0↓\nCatarrhal stage (1-2 weeks)\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0↓\nParoxysmal stage (2-4 weeks)\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 ↓\nConvalescent stage (1-2 weeks but may last 1 to 3 months)\nRemember\n\nCatarrhal stage is the stage of maximum infectivity.\nMaximum complications occur in Paroxysmal stage.', 'role': 'assistant'}]