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Cells involved in innate immunity are_________.

  • A.Phagocytes
  • B.Macrophages
  • C.Natural Killer Cells
  • D.All of the above

Answer: D

Correct answer: All of the above

All three belong to innate immunity. Phagocytes engulf and digest invaders; macrophages are the long-lived tissue phagocytes and also present antigen to T cells; natural killer cells destroy virus-infected and tumour cells without needing prior exposure. None of them requires a specific receptor for the invader, which is what distinguishes innate from acquired immunity.

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