A Physical Examination,digital Rectal Exam,was Used to Screen for Prostate

Multiple Choice

A physical examination,digital rectal exam,was used to screen for prostate cancer in 290 men with biopsy-proven prostate cancer and in 516 age- and race-matched control men,all of whom showed no evidence of cancer at biopsy.The results of the physical examination were positive in 136 cases and in 165 control men.What is the specificity of the physical examination?

A) 32%
B) 47%
C) 53%
D) 68%
E) Cannot calculate it based on given information