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: Medicine
Pancreatic pseudocyst most commonly occurs after 
Select and explain. 
A. Trauma, B. Pancreatitis, C. Pancreatic surgery, D. Pancreatic malignancy
B: Pancreatitis
Answer: B: Pancreatitis 
Explanation: Answer is B (Pancreatitis) Most common cause of pancreatic pseudocyst is Pancreatitis (90%). The second most common cause is trauma (10%).