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
True about secretin is: 
Select and explain. 
A. Increased gallbladder contraction and HCO3 rich pancreatic fluid, B. Increased gastrin secretion, C. Gastric hypermotility, D. Increase enzyme rich pancreatic fluid
A: Increased gallbladder contraction and HCO3 rich pancreatic fluid
Answer: A: Increased gallbladder contraction and HCO3 rich pancreatic fluid 
Explanation: A i.e. Increased gallbladder contraction and HCO3 rich pancreatic fluid