In which of the following characteristics of the body does the allergic reaction play an important role?

Which of the following is an important infectious disease in humans?

Match the following items in List-$I$ with List-$II$:

List-$I$	List-$II$
$(1)$ Peyer's patches	$(A)$ Autoimmune disease
$(2)$ Thymus	$(B)$ Hallucinogen
$(3)$ Hashimoto's disease	$(C)$ Primary lymphoid organ
$(4)$ $LSD$	$(D)$ Virus
$(5)$ Chikungunya	$(E)$ Secondary lymphoid organ

Match the following conditions associated with mental disorders in Column-$I$ with their respective meanings in Column-$II$ and choose the correct option.

Column-$I$	Column-$II$
$i$. Bulimia	$a$. Loss of memory
$ii$. Anorexia nervosa	$b$. Extreme overindulgence in food
$iii$. Amnesia	$c$. Sadness and inactivity in life
$iv$. Depression	$d$. Emotional aversion to food

Why is smoking cigarettes injurious to health?

Given diseases: Pneumonia,Plague,Diphtheria,Common cold,Malaria,Ringworm,Amoebiasis,Dysentery,Typhoid,$AIDS$.
$\rightarrow$ Number of bacterial diseases $- P$
$\rightarrow$ Number of viral diseases $- Q$
$\rightarrow$ Number of protozoan diseases $- R$
$\rightarrow$ Number of fungal diseases $- S$
Select the correct option for $P, Q, R$ and $S$.