This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
Which of the following causes of acute pancreatitis can cause recurrent bouts without any obvious pathology 
Select and explain. 
A. Sphincter Oddi dysfunction, B. Pancreas divisum, C. Hypertriglyceridemia, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd' i.e., All the above Causes to consider in patients with recurrent bouts of acute pancreatitis without an obvious etiology* Occult disease of the biliary tree or pancreatic ducts, especially microlithiasis, sludge* Drugs* Hypertriglyceridemia* Pancreas divisum* Pancreatic cancer* Sphincter of Oddi dysfunction* Cystic fibrosis* Idiopathic