All of the following drugs will increase the heart rate directly or by reflex when injected intravenously into a young healthy adult, EXCEPT:

All of the following drugs will increase the heart rate directly or by reflex when injected intravenously into a young healthy adult, EXCEPT:
A . isoproterenol
B . histamine
C . phentolamine
D . phenylephrine
E . atropine

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Answer: D