This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Kidney Disease & Diabetic Nephropathy, Subject name: Medicine
Which drug can be used in patients of cardio-renal syndrome? 
Select and explain. 
A. Insulin, B. NSAIDS, C. ACEI, D. ARB
A: Insulin
Answer: A: Insulin 
Explanation: None