In higher vertebrates,the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells,then it leads to

Match the following barriers of innate immunity with their respective examples and select the correct option:

List-$I$ (Barrier)	List-$II$ (Example)
$A$. Physical barrier	$i$. Skin
$B$. Physiological barrier	$ii$. Interferons
$C$. Cellular barrier	$iii$. Mucus coating
$D$. Cytokine barrier	$iv$. Saliva in mouth

Assertion $A$: Cell-mediated immunity is responsible for the rejection of organ transplants. Reason $R$: The body's immune system has the ability to differentiate between self and non-self. Which option is correct for Assertion $A$ and Reason $R$?

Which of the following immunoglobulins constitutes the largest percentage in human milk?

Which of the following is related to humoral immunity?

What are $P$ and $Q$ in the given structure?