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: Anatomy
Sphincter of Oddi consists of - 
Select and explain. 
A. 2 sphincters, B. 3 sphincters, C. 4 sphincters, D. 5 sphincters
B: 3 sphincters
Answer: B: 3 sphincters 
Explanation: Sphincter of Oddi consists of three sets of sphincters :-


Sphincter choledochus (Sphincters of Boyden).
Sphincter pancreaticus. 
Sphincter of Oddi (proper).