Test Academy | In the ABO system, blood group ‘O’ is characterized by the: presence of antigen O, absence of both antigen A and antigen B, presence of both antigen A and antigen B, presence of antigen A and absence of antigen B

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In the ABO system, blood group ‘O’ is characterized by the:

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presence of antigen O
absence of both antigen A and antigen B
presence of both antigen A and antigen B
presence of antigen A and absence of antigen B

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