(B) Turner's syndrome is a chromosomal disorder caused by the absence of one of the $X$ chromosomes,resulting in a $45, XO$ karyotype.This condition i

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(B) Turner's syndrome is a chromosomal disorder caused by the absence of one of the $X$ chromosomes,resulting in a $45, XO$ karyotype.This condition is a type of sex chromosome aneuploidy,specifically monosomy,where the individual has only $45$ chromosomes instead of the normal $46$.Therefore,the correct option is $B$.