Answer: Cholecystokinin
Step-by-step explanation:
Cholecystokinin is the hormone which is secreted by the cells of the small intestine. The secretion is stimulated under the infleunce of amino acids, hydrochloric acids, and fatty acids into stomach or duedenum. It stimulates the gallbladder to release the stored bile into the intestine to facilitate digestion of fatty foods.
According to the given condition, cholecystokinin is the hormone which is not functioning properly.