This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of these antihypeensives do not have any central action? 
Select and explain. 
A. Propranolol, B. Methyl dopa, C. Minoxidil, D. Nitroprusside
D: Nitroprusside
Answer: D: Nitroprusside 
Explanation: prpranolol is a beta blocker,methyldopa is a alpha agonist, minocidil is a potassium channel blocker and notroprusside is a nitrate all are used in treatment of hypeension. REF KD Tripathi 8th ed.