Question

Among these ............... is a physical barrier that acts a first life of defense.

• A. Skin and mucous membrane
• B. Neutrophils and monocytes
• C. Fever
• D. Interferon

Answer 1

The correct option is A Skin and mucous membrane

The very first line of defense against any invasion of the human body is a set of physical barriers between the inside of the body and the outer world. Defense systems like skin, tears, mucous membranes are considered the non-specific barriers and the first line of defense.
So, the correct answer is option A.