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: Social & Preventive Medicine
Incubation period of new disease determined by? 
Select and explain. 
A. Lead time, B. Generation time, C. Serial interval, D. Latent period
B: Generation time
Answer: B: Generation time 
Explanation: Ans. is 'b' i.e., Generation time Generation time Interval between receipt of infecton by host and maximal infectivity of the host. Generation time is roughly equal to the incubation period.