A. Gastrin
B. Secretin
C. Vagus
D. Cholecystokinin
Answer is D. Cholecystokinin
Presence of fat in the duodenum prompts secretion of CCK-PZ from the cells of the upper small intestine. CCK-PZ so released, causes contraction of the gall bladder and release of bile.
The literal meaning of the word cholecystokinin is a straightforward clue to the answer. From Greek - "chole" - bile, "cysto" - sac and "kinin" - move, which is "move the bile sac".
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