5 mm under the peritoneal surface, also appears to have positive correlation to the severity of dysmenorrhea." From above lines it is clear that pain in endometriosis coincides with the depth of lesion. As far as other options are concerned ? "The levels of CA 125 correlate with severity of the disease, but since there is a wide variety of conditions in which the levels are elevated. lts greatest use may be in monitoring a patient serially for recurrence." (ruling out "option c") "Most studies have failed to detect a correlation between the degree of pelvic pain and severity of endometriosis. Some women with extensive disease have no pain, whereas others with only minimal disease may experience severe pelvic pain and dyspareunia may be associated with infiltrating sub peritoneal endometriosis." (ruling out option "d").">