<prompt> Pain in endometriosis correlates with:Depth of invasionMultiple sitesCA 125Stage of disease  <response>: Ans. is a, i.e. Depth of invasionRef: Leon Speroff, 8ed, pl230-1231The intensity of pain associated with deeply infiltrating endometriosis relates to the depth of penetration and to the proximity or direct invasion of nerves. - Ref: Leon Speroff, 8thed, pl230However there is no relationship between stage, site or the morphological characteristic of pelvic endometriosis and pain. - Ref: Leon Speroff, 8thed, pi231 