<prompt> Distal colitis with respect to ulcerative colitis refers to:ProctitisLeft sided colon distal to splenic flexure is only involvedMid transverse colitisNone of the above  <response>: Distribution of ulcerative colitis: 1. Proctitis - involvement limited to the rectum 2. Distal colitis - Left-sided involvement limited to the colon distal to the splenic flexure 3. Pancolitis -Extensive involvement extends proximal to the splenic flexure, including pancolitis This classification known as the Montreal classification Ref: Journal of Crohns and Colitis 2012 6, 965-990. 