The compound shown in the image is used as:

$A$ large number of antibiotics have been isolated from:

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

Which of the following is a neurologically active drug?

Various phenol derivatives,tincture of iodine ($2-3\% \ I_2$ in water/alcohol) and some dyes like methylene blue are

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 :-