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
All of the following conditions cause SIADH, except 
Select and explain. 
A. Lung abscess, B. Thymoma, C. Ca pancreas, D. Interstitial nephritis
D: Interstitial nephritis
Answer: D: Interstitial nephritis 
Explanation: Lung abcess, thymoma and pancreatic cancer are all associated with SIADH. SIADH is a state of pathologic hormone excess in the presence of hyponatremia and hypo osmolality. Laboratory features of SIADH includes reduced plasma osmolality, persistent urinary secretion of sodium (20mEq/L), and inappropriately high urine osmolality.