What are the drugs that bind to the receptor site and inhibit its natural function called?

What are the salts of sorbic acid and propionic acid used as?

Which of the following statements about aspirin is not true?

The statement/s which are true about antagonists from the following is/are :-
$A.$ They bind to the receptor site.
$B.$ Get transferred inside the cell for their action.
$C.$ Inhibit the natural communication of the body.
$D.$ Mimic the natural messenger.
Choose the correct answer from the options given below :-

Cocaine is

Which one of the following is used as an antihistamine?