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
Incubation period of pertusis is:- 
Select and explain. 
A. 7-14 days, B. 1-5 days, C. 25-30 days, D. 10-25 days
A: 7-14 days
Answer: A: 7-14 days 
Explanation: Ans. is 'a' i.e. 7-14 days