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A 48 year old man presents to the emergency room with severe headache and blurred vision. His blood pressure is 230/140. Ophthalmologic examination reveals blurred optic discs with indistinct margins. An intravenous drip of sodium nitroprusside is started.
What is the mechanism of action of sodium nitroprusside?
A- Alpha adrenergic antagonist
B- Beta adrenergic antagonist
C- Ganglion blocker
D- ACE inhibitor
E- Direct smooth muscle vasodilator
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