A) Interferons - secreted by virus-infected cells and protect non-infected cells from further viral infection.
B) B- lymphocytes - produce antibodies in response to pathogens into blood to fight with them.
C) Macrophages - mucus secreting cells that trap microbes entering in the body.
D) IgA - present in colostrum in early days of lactation to protect infant from diseases.
Correct Answer: C
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