This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening for Disease, Subject name: Social & Preventive Medicine
Period between the possible time of detection and the possible time of diagnosis is 
Select and explain. 
A. Lead time, B. Screening time, C. Generation time, D. Serial interval
A: Lead time
Answer: A: Lead time 
Explanation: Ans. a (Lead time) (Ref. Park's textbook of PSM 22nd/p 95)Lead Time# It is advantge gained by screening, i.e., period between diagnosis by early detection and diagnosis by other means.# It is period between the possible time of detection and possible time of diagnosis.Latent Period# Time between exposure to a risk factor and subsequent development of clinical manifestations of a particular disease.Sreening Time# Interval between first clinical detection and final critical point.Seriai Interval# Time gap between onset of primary and secondary case. It is the measure of incubation period.