<prompt> Air in the biliary tract is seen in all exceptGall stone ileusSclerosing cholangitisCarcinoma gall bladderEndoscopic papillotomy  <response>: Gallstone ileus, carcinoma gall bladder and endoscopic papillotomy can cause pneumobilia air in biliary tractAscending cholangitis not sclerosing cholangitis can cause pneumobilia. 