A 56-year-old female presents at the emergency department after a sudden-onset middle and upper abdominal pain for 12 hours,and was diagnosed of acute pancreatitis after examination. Which of the following statements is FALSE about acute pancreatitis?
A.About 50% are secondary to bile duct diseases. B.Bacterial infection is not a major cause of onset. C.Further diagnostic evidence is needed if hematuria amylase is not high. D.Sudden death is possible in certain types. E.Residual pancreatic pseudocyst is possible.