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: Surgery
Lithogenic bile has the following propeies: 
Select and explain. 
A. Increased bile and cholesterol ratio, B. Decreased bile and cholesterol ratio, C. Equal bile and cholesterol ratio, D. Decreased cholesterol only
B: Decreased bile and cholesterol ratio
Answer: B: Decreased bile and cholesterol ratio 
Explanation: Bile salts and phospholipids in bile keep cholesterol in solution by the formation of micelles. An excess of cholesterol relative to bile salts and phospholipids allow cholesterol to form crystals and such bile is called lithogenic or supersaturated bile. Ref: Harrison 17/e, Page 1991; Maingot's 10/e, Page 1718