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: Pathology
Most common paraneoplastic syndrome associated with small cell lung cancer? 
Select and explain. 
A. SIADH, B. Cushing, C. Hypercalcemia, D. Polycythemia
A: SIADH
Answer: A: SIADH 
Explanation: Most common paraneoplastic syndrome associated with small cell lung cancer => SIADH > Cushing syndrome.