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
Amylase increased in pleural fluid is seen in following except - 
Select and explain. 
A. Rheumatoid arthritis, B. Esophageal perforation, C. Malignancy, D. Gall stone pancreatitis
A: Rheumatoid arthritis
Answer: A: Rheumatoid arthritis 
Explanation: None