<prompt> A 20-year-old female complains of vaginal bleeding. Diagnostic workup reveals clear cell adenocarcinoma of the vagina. A maternal history should be obtained for use of?ThalidomideOral DESLoss of sensation in the scrotumabsent bulbocavernosus refl  <response>: Oral DES was given to patients who were unable to conceive. Fortunately, this complication is unlikely to occur, because DES has been withdrawn as a drug used for this purpose. 