q.2_____________? - sarim

[ArchivalUser]

Heart rate response by "drug X' alone and when given pretreatment with the listed drugs:

(Pretreatment with)........ ("Drug X" HR response)

NONE.....................................Incr
Mecamylamine....................... Incr
Prazosin................................ Incr
Atropin.................................. Incr
Propronolol............................ NO change from normal HR

Identify the "Drug X"

A-Methoxamine
B-Epinephrine
C-Physostigmine
D-Norepinephrine
E-Acetylcholine