Interferons were first discovered from cells infected with which of the following?

Which of the following are autoimmune disorders?
$A$. Myasthenia gravis
$B$. Rheumatoid arthritis
$C$. Gout
$D$. Muscular dystrophy
$E$. Systemic Lupus Erythematosus $(SLE)$
Choose the most appropriate answer from the options given below:

Select the $CORRECT$ statement.

The figure given below shows an antibody molecule. Name the parts $A, B$ and $C$.

Which is the main physical barrier in our body?

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$a$. Cellular barrier	$i$. Interferons
$b$. Cytokine barrier	$ii$. Mucus
$c$. Physical barrier	$iii$. Neutrophils
$d$. Physiological barrier	$iv$. $HCl$ in gastric juice

Choose the correct answer from the options given below: