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Discussion

The letters A to E in the hepatitis viruses denote

  • A.increasing severity of the resulting illness
  • B.the five stages of a single infection
  • C.five subtypes of one virus species
  • D.distinct viruses named in order of discovery

Answer: D

Each letter marks a separate, unrelated virus identified as the causes of hepatitis were teased apart. They differ in family, genome, transmission and outcome, so the alphabet records history rather than any biological ordering.

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