You can BLOCK the DECREASE in heart rate following parasympa

You can BLOCK the DECREASE in heart rate following parasympathetic nervous system activation with an intravenous injection of

either A or C

I think the answer is d or e

a)	a nicotinic acetylcholine receptor antagonist

b)	a muscarinic acetylcholine receptor antagonist

c)	an adrenergic receptor antagonist

d)	either A or B

e)	either A or C I think the answer is d or e

The correct answer is : b) a muscarinic acetylcholine receptor antagonist.

Reason:A muscarinic acetylcholine receceptor antagonist such as atropine will increase the heart rate thus reducing heart block.