Which of the following is the smallest known virus:
Correct answer: C. Polio virus
- A. Hepatitis virus
- B. Retrovirus
- C. Polio virus
- D. Pox virus
Explanation
Among these options, poliovirus is the smallest, with a compact, non-enveloped capsid and a genome of roughly 7.5 kilobases. Poxviruses are among the largest viruses, and retroviruses and hepatitis viruses are larger than poliovirus, so students may incorrectly associate small size with any simple virus.
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