<prompt> Which of the following is the anterior relation to first pa of duodenum ?root of mesentarysuperior mesenteric vesselstransverse mesocolongallbladder  <response>: Visceral Relations of 1st pa of duodenum Anteriorly: 1Quadrate lobe of liver, and 2 gall bladder. Ref : B D Chaurasias Human Anatomy , seventh edition , voulme 2 , pg. no., 286 Fig. 20.8a 