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
[{'content': 'Lithogenic bile has the following properties - \nSelect and explain. \nA. ↑ Bile and cholesterol ratio, B. ↓Bile and cholesterol ratio, C. Equal bile and cholesterol ratio, D. ↓Cholesterol only', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bile salts and phospholipids in bile keep cholesterol in solution by the formation of micelles.\nAn excess of cholesterol relative to bile salts and phospholipids allows cholesterol to form crystals and such pile is called Lithogenic or super-saturated bile.\n\nPathogenesis of Cholesterol gallstones \n\nThere are three elements necessary for the formation of cholesterol gallstones\n\n\nLithogenic bile\nNucleation and\nStasis or gallbladder hypomotility', 'role': 'assistant'}]