<prompt> True about OCG is a First done by Graham Cole in 1942b Dye ingested at rate of 1 mlkgc USG has replaced itd Dye used is telepaqueabcdbdac  <response>: OCG was introduced by Graham and Cole in 1924 not in 1942.Two doses of 3 gm of dye is given -- first dose 14 hours, and second dose 3-4 hours prior to post-contrast examination.OCG has largely been replaced by USGDye most commonly used is NaCa Ipanoic acid Telepaque. 