The following molecule with the structure acts as:

Match the items in List-$I$ with the items in List-$II$.

List-$I$	List-$II$
$(A)$ Antibiotic chloramphenicol	$(1)$ Goitre
$(B)$ Deficiency of thyroxine hormone containing iodine	$(2)$ Malaria
$(C)$ Chloroquine	$(3)$ Typhoid
$(D)$ Halothane	$(4)$ Anaesthetic

Consider the following:
Assertion $(A)$: Aspirin is useful in the prevention of heart attacks.
Reason $(R)$: Aspirin acts as an anti-blood clotting agent.
The correct answer is:

Which is the correct structural formula of Aspirin?

Which of the following statements are correct?
$I$. Binding of inhibitor at allosteric site changes the shape of the active site.
$II$. Shape of the receptor does not change after attachment of chemical messenger to it.
$III$. $A$ chemical messenger gives message to the cell by entering it.
$IV$. Erythromycin is an example of bacteriostatic antibiotic.

Which of the following is a component of tranquilizer drugs?