This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'Bile acids are synthesized from \nSelect and explain. \nA. Cholesterol, B. Amino acids, C. Bilirubin, D. Protein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bile is a digestive juice formed continuously in liver. Bile contains organic substances like bile salts which are formed when conjugated bile acids combine with Na/K. Bile acids are of two types: Primary bile acids are choilc acid & chenodeoxycholic acid.These are synthesized by hepatocytes from cholesterol. Secondary bile acids are deoxycholic acid & lithocholic acid. These are formed from the primary bile acids in the colon by the action of intestinal bacteria.Ref: Medical Physiology, Indu Khurana', 'role': 'assistant'}]