<prompt> A common cause of Cushing syndrome is -Cancer producing ectopic ACTHPituitary adenomaAdrenal tuberculosisNone of the above  <response>: 75 cases of Cushings syndrome is caused by ACTH-producing pituitary adenomas Cushings disease; Ectopic ACTH syndrome - 15; adrenocoical adenomas-5 to 10 and adrenocoical carcinoma-1 and other rare causes-1. Reference : page 2314 Harrisons Principles of Internal Medicine 19th edition 