This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Epidemiology, Subject name: Social & Preventive Medicine
Incubation period of Influenza is:- 
Select and explain. 
A. 1-3 days, B. 7-10 days, C. 10-14 days, D. 1-6 hours
A: 1-3 days
Answer: A: 1-3 days 
Explanation: Incubation period :- Time interval b/w entry of organism till appearance of first sign / symptom. I.P of influenza is 1-3 days.( 18-72 hours)