How many of the following organisms have $RNA$ as their genetic material?
$TMV$,Humans,Bacteria,$Q\beta$ bacteriophage,Bacteriophage $\lambda$,Yeast,Maize,$\phi \times 174$ bacteriophage,Retroviruses.

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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