<prompt> Primary bile acid isDeoxycholic acidLithocholic acidChenodeoxycholic acidNone  <response>: Bile acids are formed from cholesterol. Types:a Primary bile acids: They are synthesized in the liver from cholesterol. They are mainly two:Cholic acid: Quantitatively the largest in an amount in bile.Chenodeoxycholic acid.b Secondary bile acids: They are produced in the 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: Harper;s Biochemistry; 30th edition 