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
In a patient with chronic congestive cardiac failure,all of the following drugs prolong survival, except 
Select and explain. 
A. Metoprolol, B. Carvedilol, C. Enalapril, D. Digoxin
D: Digoxin
Answer: D: Digoxin 
Explanation: None