A man with blood group $B$ marries a women with blood group $A$ and their first child is having blood group $B$. What is the genotype of child

  • A

    ${I^a}{I^b}$

  • B

    ${I^a}{I^o}$

  • C

    ${I^b}{I^o}$

  • D

    ${I^b}{I^b}$

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