<prompt> Posterior relations of head of pancres are all except:Common bile ductFirst pa of duodenumAoaInferior vena cava  <response>: B i.e. First pa of duodenumCommon bile duct, inferior venacava lie posterior to head; aoa lies posterior to uncinate process of head; whereas 1St pa of duodenum lie superior anterior to head of pancreas not posterior 