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: Pharmacology
All are true about metformin except: 
Select and explain. 
A. Inhibits cellular respiration in mitochondria, B. Excreted unchanged in urine, C. Reduce hepatic glucose production, D. Used in decompensated heart failure
D: Used in decompensated heart failure
Answer: D: Used in decompensated heart failure 
Explanation: None