In human beings influenza is caused by_________?

Correct answer: C. virus

  • A. bacteria
  • B. protist
  • C. virus
  • D. fungi

Explanation

Influenza is caused by influenza viruses, which are enveloped RNA viruses that infect the respiratory tract. Students may choose bacteria because influenza commonly causes fever and respiratory symptoms, but symptoms do not identify the pathogen type.

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