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
SIADH is associated with : 
Select and explain. 
A. Small cell carcinoma lung, B. Adeno carcinoma lung, C. Squamous cell carcinoma lung, D. Mixed cell tumor lung
A: Small cell carcinoma lung
Answer: A: Small cell carcinoma lung 
Explanation: Answer is A (Small cell Ca of lung): Small cell Ca of lung causes SIADH due to ectopic secretion of ADH.