Mucus coating of epithelium lining the respiratory and gastro intestinal tract is an example of

The exaggerated response of the immune system to certain foreign antigens is called_____Choose the option that fills the blank correctly.

Mucosa associated Iymphoid tissue $\left(\mathrm{MALT}\right)$ constitutes about ____ percent of the total lymphoid tissue in the human body.

Choose the option that fills the blank correctly.