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: Biochemistry
Bile acids synthesized in the liver (Primary bile acids) - 
Select and explain. 
A. Cholic acid, B. Chenodeoxycholic acid, C. Taurocholic acid, D. All of these
D: All of these
Answer: D: All of these 
Explanation: Primary bile acids are cholic acid and chenodeoxycholic acid. These are conjugated with glycine and taurine to form glycocholic acid, glycochenodeoxycholic acid, taurocholic acid, and taurochenodeoxycholic acid.
Secondary bile acids are deoxycholic acid and lithocholic acids.