This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Physiology
The most important cholorectic is: 
Select and explain. 
A. Bile salt, B. CCK, C. Secretin, D. Gastrin
A: Bile salt
Answer: A: Bile salt 
Explanation: Ans. A. Bile salta. Cholagogue is the one which causes gall bladder contraction, thereby increasing flow (eg CCK - PZ)b. Choleretic increases secretion of bile (eg- Bile salt)