Roger is undergoing treatment for a sex-linked chromosomal abnormality. He is treated with testosterone replacement therapy, which fosters the growth of male sex characteristics and elevates his mood, but does not reverse his infertility. Roger is being treated for

A) Klinefelter syndrome.
B) Turner syndrome.
C) "Supermale" syndrome.
D) Down syndrome.

Klinefelter syndrome is a sex-linked chromosomal condition affecting males, characterized by an extra X chromosome (XXY). It can lead to symptoms such as reduced testosterone levels, which can cause underdeveloped male sex characteristics and infertility. Testosterone replacement therapy is a common treatment to help manage symptoms, but it does not address infertility.