In which way has the study of biology helped us to control infectious diseases?

Identify the odd one out in the context of drugs.

Which of the following pairs is mismatched?

Match the following:

Column-$I$	Column-$II$
$(A)$ Ringworms	$(P)$ $W. malayi$
$(B)$ Elephantiasis	$(Q)$ Rhino virus
$(C)$ Common cold	$(R)$ $HIV$
	$(S)$ $Trichophyton$

Diseases spread through water medium $- P$
Diseases spread through air medium $- Q$
Diseases spread through insect vectors $- R$
$I -$ Common cold,$II -$ Amoebiasis,$III -$ Typhoid,$IV -$ Filariasis
$V -$ Pneumonia,$VI -$ Malaria,$VII -$ Ascariasis
Select the correct option for $P, Q$ and $R$.
$\quad P \quad\quad Q \quad\quad R$

Bulimia is a type of psychosis,which means . . . . . . .