Mother is responsible for the sex of the baby.

Mother

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Father

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Solution

The correct option is B
Father

Mother has XX pair of sex chromosomes while father has XY pair of sex chromosomes. Hence, mother always contributes an X chromosome, while father can either contribute an X or Y chromosome. If the father contributes an X then the baby will be a girl and if Y then the baby will be a boy. Hence, it is the father who is responsible for the sex of the baby.

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