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	Phyiological barrier	IV	HCl in gastric juice

Choose the correct answer from the options given below. 

A-III, B-I, C-II, D-IV
A. Neutrophils, a type of WBC, play a crucial role in the cellular barrier against infections. Neutrophils are
Among the first immune cells to reach the site of infection or inflammation. They are attracted to the site of
Infection and protect from pathogens through phagocytosis and the release of antimicrobial substances.
B. Interferons are a group of signaling proteins that play a key role in the cytokine barrier against viral infections.
C. Mucus serves as a physical barrier in the body. It is secreted by the lining of the respiratory tract, digestive system, and reproductive tract. Mucus helps to trap and remove foreign particles, such as dust, bacteria, and viruses, from entering the body and causing infections.
D. HCl (hydrochloric acid) is a component of gastric acid found in the stomach. It serves as a physiological barrier in the digestive system. The acidic environment created by HCl kills microbes ingested with food, protecting the body from potential infections.