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
[{'content': 'Sphincter of Oddi consists of - \nSelect and explain. \nA. 2 sphincters, B. 3 sphincters, C. 4 sphincters, D. 5 sphincters', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sphincter of Oddi consists of three sets of sphincters :-\n\n\nSphincter choledochus (Sphincters of Boyden).\nSphincter pancreaticus. \nSphincter of Oddi (proper).', 'role': 'assistant'}]