<prompt> Which of the following is the most common non-alcoholic cause of acute pancreatitisThiazidesHypercalcaemiaGall stonesHyperlipidaemia  <response>: Gallstones are hardened deposits of digestive fluid. Gallstones can vary in size and number and may or may not cause symptoms. People who experience symptoms usually require gallbladder removal surgery. Gallstones that dont cause symptoms usually dont need treatment Ref : Oxford textbooks of surgery 2nde p. 1766 