<prompt> Posterior relations of head of pancreas are all except -Common bile ductFirst part of duodenumAortaInferior vena cava  <response>: First part of duodenum is anterior to head of pancreas.IVC and common bile duct are posterior to head of pancreas.Option C is tricky here. Aorta is posterior to uncinate process which in turn is a part of head of pancreas. 