This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Gallbladder contraction is stimulated by : 
Select and explain. 
A. Gastrin, B. Secretin, C. Vagus, D. Cholvcvstokinin
D: Cholvcvstokinin
Answer: D: Cholvcvstokinin 
Explanation: D i.e. Cholecystokinin