Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

  • A
    Erythroblastosis foetalis - $X$-linked
  • B
    Down's syndrome - $44$ autosomes + $XO$
  • C
    Klinefelter's syndrome - $44$ autosomes + $XXY$
  • D
    Colour blindness - $Y$-linked

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