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
All of the following drugs reduce afterload except 
Select and explain. 
A. Enalapril, B. Propanonol, C. Hydralazine, D. Sodium nitroprusside
B: Propanonol
Answer: B: Propanonol 
Explanation: Ref-KDT 6/e p504 Afterload is reduce after the drug having Aeriolar delating propey.propananol is a non selective Beta blocker.it can cause vasoconstriction by antanagolizing beta2 mediated vasodilation.it,do not decreases afterload