Which One of the Following Is an Accurate Definition of the Sensitivity

Which one of the following is an accurate definition of the sensitivity of a screening test?

A) The percentage of screening tests that is positive
B) The percentage of screening tests that is negative among patients who remain unaffected by the condition of interest after screening
C) The percentage of screening tests that is positive among patients who remain unaffected by the condition of interest after screening
D) The probability of a diagnosis of the condition of interest after a positive screening test