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true but none of the other options cause pancreatic duct dilation. options a, b and c would cause obstruction above the level of pancreas.
It doesn't say ONLY pancreatitis, but just enough information to choose the correct answer. Maybe, in the test writers mind if they mention cholangitis and jaundice that would be too much hints :).
and also among the other answer choices cross sectional study is the only one thats used for population study