<prompt> Which is the most common site of intestinal obstruction caused by a gall stone?Proximal ileumTerminal ileumilleo cecal junctionAscending colon  <response>: Most common site of intestinal obstruction by a gallstone is the ileum 60 at the ileocecal junction which is the narrowest pa, followed by jejunum 15, stomach 15 and colon 5. In the absence of an intestinal stricture a gallstone of at least 2cm is required to cause intestinal obstruction. 