Q. With reference to the human immune system, what does the term Innate Immunity refer to?

[A] An antigen-specific defense mechanism developed after exposure to a pathogen or vaccine.

[B] The first line of defense that provides immediate, non-specific protection against a broad range of pathogens.

[C] A type of immunological memory that allows for a rapid response upon a second encounter with a specific virus.

[D] Immunity mediated exclusively by specialized B-lymphocytes and T-lymphocytes.

Answer: B
Notes:

Explanation:

Innate immunity is present from birth. It includes physical barriers (skin, mucus) and non-specific cells (macrophages) that respond immediately to any foreign invader, unlike Adaptive Immunity, which is specific and acquired over time.

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