Which of the following is a mental disease?

Match the disease with its correct pathogen/causative agent.

List-$I$	List-$II$
$(1)$ Breakbone fever	$(A)$ Leprosy
$(2)$ Tetanus	$(B)$ Flavi-arbo virus
$(3)$ Ascariasis	$(C)$ Clostridium tetani
$(4)$ Leprosy	$(D)$ Ascaris lumbricoides

Match the following columns:

Column-$I$	Column-$II$
$1$. Allergy	$a$. Immunodeficiency
$2$. Autoimmunity	$b$. Serotonin
$3$. $AIDS$	$c$. $IgA$
$4$. Colostrum	$d$. Multiple sclerosis

Identify $X$ and $Y$ from the following structure of an antibody molecule.

In the given diagram of the life cycle of Plasmodium,what does the part labeled '$A$' represent?

Identify the molecules $(A)$ and $(B)$ shown below and select the right option giving their source and use.
| Molecule | Source | Uses |
| :--- | :--- | :--- |