This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'Which of the following is not an anterior relation of second pa of duodenum ? \nSelect and explain. \nA. gallbladder, B. transverse colon, C. transverse mesocolon, D. head of pancreas', 'role': 'user'}, {'content': "Answer: D \nExplanation: Anterior Visceral relation of 2nd pa of duodenum: (a) Right lobe of the liver; (b) transverse colon, (c) root of the transverse mesocolon, and (d) small intestine. Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 2 , pg. no., 286. FIG Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 2, Fig. 20.8a ( pg. no., 286 ).", 'role': 'assistant'}]