Multiple choice general knowledge

Blood can be classified into how many main types of groups?

  1. Four

  2. Three

  3. Five

  4. None of the above
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A Correct answer
Explanation

Human blood is classified into four main groups based on the ABO system: A, B, AB, and O. Each group can be Rh-positive or Rh-negative, creating eight total types, but the fundamental classification is four groups. This is the most basic blood typing system used worldwide.

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