Lactose is a disaccharide of

  • A
    $\alpha-D$-glucose and $\alpha-D$-fructose
  • B
    $\beta-D$-glucose and $\beta-D$-galactose
  • C
    $\alpha-D$-glucose and $\beta-D$-ribose
  • D
    $\alpha-D$-glucose and $\beta-D$-galactose

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