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: Pediatrics
Which of the following is the most common cause of pancreatic pseudocyst? 
Select and explain. 
A. Ca pancreas, B. Pancreatitis, C. Trauma, D. ERCP
B: Pancreatitis
Answer: B: Pancreatitis 
Explanation: Pancreatic pseudocysts mostly occur as a complication of acute and chronic pancreatitis. In children, abdominal trauma is the most common cause.