Sphincter of Oddi consists of -: (A) 2 sphincters, (B) 3 sphincters, (C) 4 sphincters, (D) 5 sphincters
Answer is B. Sphincter of Oddi consists of three sets of sphincters :-


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