<prompt> A 45-year-old man has recently been the recipient of a hea transplant. Which one of the following drug is least likely to cause tachycardia in this patientAmphetamineDobutamineEpinephrineNorepinephrine  <response>: The transplanted hea doesnt have sympathetic innervation. Hence an indirectly acting sympathomimetic like Amphetamine has the least likelihood of causing tachycardia when compared to the directly acting ones. 