Which of the following disorders is a sex-linked disorder?

Question

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Fragile-X syndrome is a sex-linked disorder that is caused by a mutation on the X chromosome. It primarily affects males, but females can also be carriers of the mutation. The other disorders listed are not sex-linked disorders. Down syndrome is caused by a trisomy of chromosome 21, Klinefelter's syndrome is caused by an extra X chromosome in males, Turner's syndrome is caused by a missing X chromosome in females, and Tay Sachs is caused by a deficiency in an enzyme.

Which of the Following Disorders Is a Sex-Linked Disorder