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
Fat in the duodenum lumen : 
Select and explain. 
A. Stimulates gall bladder contraction, B. Inhibits gall bladder contraction, C. Inhibits CCK secretion, D. Releases Secretin
A: Stimulates gall bladder contraction
Answer: A: Stimulates gall bladder contraction 
Explanation: A i.e. Stimulates gall bladder contraction