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
The time interval between diagnosis 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

The lead time is the time period between diagnosis by early detection (i.e., earliest point of diagnosis by screening test) and diagnosis by standard diagnostic tests.
Lead time is the advantage gained by screening.