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
Which among the following is primary bile acid? 
Select and explain. 
A. Deoxycholic acid, B. Lithocholic acid, C. Chenodeoxycholic acid, D. All of the above
C: Chenodeoxycholic acid
Answer: C: Chenodeoxycholic acid 
Explanation: Chenodeoxycholic acid and cholic acid are the primary bile acids.
Deoxycholic acid and Lithocholic acid are the secondary bile acids.