The best $HLA$ (Human Leucocyte Antigen) match for transplants in order of preference is:

  • A
    $Parent > Sibling > Twin > Unrelated donor$
  • B
    $Sibling > Twin > Parent > Unrelated donor$
  • C
    $Twin > Unrelated donor > Parent > Sibling$
  • D
    $Twin > Sibling > Parent > Unrelated donor$

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