Final answer:
CCK does not cause the hepatopancreatic sphincter to constrict; it actually prompts it to relax to allow digestive juices to enter the duodenum.
Step-by-step explanation:
The question is about cholecystokinin (CCK), which is a hormone involved in the digestive process. It is not true that CCK causes the hepatopancreatic sphincter to constrict. In fact, CCK has the opposite effect, causing this sphincter to relax, thus allowing the bile and pancreatic juices to flow into the duodenum. CCK is indeed released when fatty chime enters the duodenum, stimulates the gallbladder to contract to release bile, and induces the secretion of enzyme-rich pancreatic juice. Therefore, option A) 'cause the hepatopancreatic sphincter to constrict' is not true for cholecystokinin.