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Which microorganism causes AIDS?

  • A.A protozoa
  • B.A bacteria
  • C.A virus
  • D.An algae

Answer: C

Correct answer: A virus

AIDS is caused by HIV, the human immunodeficiency virus - a retrovirus that infects CD4 helper T cells. Their gradual loss is what leaves the patient open to the opportunistic infections that define the disease.

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