$A$: Microbes have been used for the welfare of humanity.
$R$: The fields of biotechnology and genetic engineering have developed.

  • A
    $A$ and $R$ are both true. $R$ is the correct explanation of $A$.
  • B
    $A$ and $R$ are both true. $R$ is not the correct explanation of $A$.
  • C
    $A$ and $R$ are both false.
  • D
    $A$ is false and $R$ is true.

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