Which pair represents diseases spread through the air?

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

Identify the correct match:

$(a)$	$(b)$	$(c)$
$1$. Typhoid	$a$. Virus	$P$. Nose
$2$. Malaria	$b$. Bacteria	$Q$. Liver cells
$3$. Common cold	$c$. Protozoans	$R$. Small intestine

Match the cells with their respective functions:

Cells	Functions
$(1)$ $T_H$ cell	$(A)$ Histamine secretion
$(2)$ Macrophage	$(B)$ Antibody production
$(3)$ Mast cells	$(C)$ Phagocytosis
$(4)$ $NK$ cell	$(D)$ Help in antibody production
$(5)$ Plasma cell	$(E)$ Cell-mediated immunity

"Prevention is better than cure". Comment.

Select the correct pairs of diseases and their respective symptoms.
$i$. Elephantiasis - swollen limbs especially legs, enlargement of lymph vessels and lymph nodes.
$ii$. Malaria - Infected skin which shows enlarged red rings, nails become thick, discoloured and disfigured.
$iii$. Dermatophytosis - Cyclic high fever followed by sweating and sudden shivering every two days or three days.
$iv$. Pneumonia - Dyspnea, cough produces yellow or greenish sputum or phlegm.
Choose the correct option.