This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
The drug that is not useful in congestive hea failure is 
Select and explain. 
A. Adrenaline, B. Digoxin, C. Hydrochiorothiazide, D. Enalapril
A: Adrenaline
Answer: A: Adrenaline 
Explanation: Adrenaline causes vasoconstriction of coronary vessels and hence not used in hea failure. Digoxin cause an increase in accumulation of intracellular Calcium accumulation and is useful in hea failure. Thiazide decreases preload. enalapril or ACE inhibitors are useful to prevent remodeling of hea in hea failure (REF. Essentials of medical pharmacology KD TRIPATHI 6 Edition)