<prompt> Lead time is:Time from early diagnosis to starting treatmentTime from treatment to mortalityTime between detection of disease through screening and its clinical symptomsTime between clinical symptom to complete treatment  <response>: Ans. c Time between detection of disease through screening and its clinical symptomsRef: K. Park 23rd ed. 99-100 Lead time is the length of time between the detection of a disease and its usual clinical presentation and diagnosisOR It is the time between early diagnosis with screening, and when diagnosis would have been made without screening. 