<prompt> The mechanism of action of sodium nitroprusside is:Increased cAMPStimulation of guanylate cyclaseCalcium channel blockageK channel opener  <response>: Ans. B Stimulation of guanylate cyclaseRef: KDT 8the p544Sodium nitroprusside acts by releasing nitric oxide NO. This stimulates guanylate cyclase and results in the elevation of cGMP, which is a potent vasodilator. 