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': 'Incubation period of pertusis is:- \nSelect and explain. \nA. 7-14 days, B. 1-5 days, C. 25-30 days, D. 10-25 days', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. 7-14 days", 'role': 'assistant'}]