This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
The time interval between diagnosis by early detection and diagnosis by other means is - 
Select and explain. 
A. Incubation period, B. Lead time, C. Serial interval, D. Latent period
B: Lead time
Answer: B: Lead time 
Explanation: .lead time is the advantage gained by screening.that is the period between diagnosis by early detection and diagnosis by other means.the benefits are alwaysd evaluated in terms of outcomes. ref:park&;s textbook ,22 nd edition,pg no 128