In addition to ABO group, Rh group should also be matched before transfusions because

• A

  an Rh+ve person, if exposed to Rh-ve blood, will produce anti-Rh antibodies

• B

  an Rh-ve person, if exposed to Rh+ve blood, will produce anti-Rh antibodies

• C

  erythroblastosis foetalis occurs if mother is Rh+ve and foetus is Rh-ve

• D

  the Rh antigen is similar to one present in Rhesus monkeys