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 diagnosid by early detection of screening and diagnosis by other means is - 
Select and explain. 
A. Serial interval, B. Lead time, C. Time lag, 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..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 always evaluated in terms of outcomes. ref:park&;s textbook ,22 nd edition,pg no 131