<prompt> Patient intoxicated himself with two bottles of nasal decongestant whose primary ingredient was alpha agonist drug. Which is earliest sign seen?TachycardiaDilatation of pupilVasodilationAll of the above  <response>: Ans. B. Dilatation of pupilStimulation of alpha receptors causes dilation of pupil. Whereas tachycardia and vasodilation are due to beta receptor stimulation. 