Receptor level antagonism is shown by?

Receptor level antagonism is shown by ?
a) Adrenaline and Isoprenaline
b) Histamine and adrenaline
c) Isoprenaline and propranolol
d) All of the above

Correct Answer - C
AnS. C. Isoprenaline and propranolol
Receptor antaoonists (Pharmalogical antaqonists)
Receptor antagonists are those drugs that blocks the action of
agonist by acting on same recePtors.
Isoprenaline is beta1 & beta2 receptor agonist while propranolol has
antagonistic action on beta1 & beta2 recePtors (option ā€˜cā€™)