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
[{'content': 'All of the following drugs reduce afterload except \nSelect and explain. \nA. Enalapril, B. Propanonol, C. Hydralazine, D. Sodium nitroprusside', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]