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When is World Blood Donor Day, recognized by the UN is observed as-

  • A.December 11
  • B.July 11
  • C.November 25
  • D.June 14

Answer: D

World Blood Donor Day is observed on 14 June.

It is the birthday of Karl Landsteiner, who discovered the ABO blood groups in 1901 and won the Nobel Prize for it. The day promotes voluntary unpaid donation, which is the safest kind.

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