This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, 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: The sphincter of Oddi is a muscular valve that controls the flow of digestive juices through the ampulla of vater into the second pa of the duodenum. It is named after ruggero oddi. Ref - BDC 6e vol2 pg259 , britannica.com