The body's first line of defense is formed by the stratum corneum. Thus, the correct option is B.
What are the components of the body's first line of defense?
The components of the body's first line of defense are skin, tears, mucous, saliva, etc are the physical barriers that offer the first line of defense against foreign substances.
The Stratum corneum is the outermost layer of the epidermis that stimulates the synthesis of skin which is considered the most important component of the body's first line of defense.
Therefore, the correct option is B.
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