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
All are primary functions of bile acids, EXCEPT: 
Select and explain. 
A. To promote bile flow, B. To solubilize cholesterol and phospholipid in the gallbladder, C. To enhance dietary lipid digestion and absorption, D. To promote bile secretion
D: To promote bile secretion
Answer: D: To promote bile secretion 
Explanation: The primary functions of bile acids are (1) to promote bile flow, (2) to solubilize cholesterol and phospholipid in the gallbladder (3) to enhance dietary lipid digestion and absorption Ref: Harrison, E-18, P-2461