$A$: Antibiotics like penicillin can be used to treat common cold.
$R$: Penicillin causes lysis of viral cells.

$A$ mentally sick person has:

Consider the given statements and select the true ones $:-$
$(A)$ Health could be defined as a state of complete physical,mental and social well-being.
$(B)$ Pathogens can enter our body by various means,multiply and never interfere with the functions of organs/organ systems.
$(C)$ Salmonella typhi is a pathogenic virus which causes typhoid fever.
$(D)$ Plasmodium reproduces asexually in liver cells and $\text{RBC}$ of human.

"Prevention is better than cure". Comment.

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

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