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    The blood of two men was tested and the results are shown. Anti-D refers to the rhesus blood group. Clotting indicates that antigens associated with a particular factor or blood group are present in a blood sample.

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    HLPaper 1A

    The blood of two men was tested and the results are shown. Anti-D refers to the rhesus blood group. Clotting indicates that antigens associated with a particular factor or blood group are present in a blood sample.

    The man who tested positive for anti-D was then tested for ABO blood group. These results were obtained.

    What ABO blood group does the man testing positive for anti-D have?

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