Why is testing of $Rh$ group necessary before blood transfusion?

  • A
    To prevent blood clotting
  • B
    To avoid immune response against $Rh$ antigens
  • C
    To increase blood volume
  • D
    To prevent infection

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$I$. Liver
$II$. Lymph node
$III$. Spleen
$IV$. White bone marrow
$V$. Red bone marrow
Choose the correct option.

Which type of white blood cells are associated with the release of histamine and the natural anticoagulant heparin?

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