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
[{'content': 'The Daily synthesis of bile acid is: \nSelect and explain. \nA. 200 mg, B. 250 mg, C. 500mg, D. 750 mg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The two primary bile acids are cholic acid and chenodeoxycholic acid Two secondary bile acids are deoxycholic acid and lithocholic acid. 500 mg bile acids are synthesized in the liver daily. Ref: Harrison, E-18, P-2461.', 'role': 'assistant'}]