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: Surgery
Amylase is raised in all except 
Select and explain. 
A. Parotitis, B. Pancreatic pseudocyst, C. Serous cyst adenoma of pancreas, D. None of the above
C: Serous cyst adenoma of pancreas
Answer: C: Serous cyst adenoma of pancreas 
Explanation: In Serous cyst adenoma of pancreas both amylase and CEA levels are decreased.