This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
[{'content': 'Which of the following is a secondary bile acid? \nSelect and explain. \nA. Cholic acid, B. Chenodeoxy cholic acid, C. Litho Cholic acid, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bile acids are formed from cholesterol.Types(a) Primary bile acids: They are synthesised in the liver from cholesterol. They are mainly two:Cholic acid: Quantitatively the largest in amount in bile.Chenodeoxy cholic acid.(b) Secondary bile acids: They are produced in intestine from the primary bile acids by the action of intestinal bacteria, they are produced by deconjugation and 7-a-dehydroxylation. They are mainly two:Deoxycholic acid: Formed from cholic acid.Lithocholic acid: Formed from chenodeoxycholic acid.Ref: M.N. Chatterjea - Textbook of Biochemistry, 8th edition, page no: 438', 'role': 'assistant'}]