<prompt> Gastro-intestinal hormone in the following isPepsinPtyalinCholecystokininTrypsin  <response>: Option A Pepsin is a proteolytic enzyme in gastric juice. Option B Ptyalin or amylase is an amylolytic carbohydrate splitting enzyme in saliva. Option D Trypsin is a proteolytic enzyme in pancreatic juice.Cholecystokinin-Pancreozymin is a gastro-intestinal hormone that has actions on both pancreas and gall bladder. 