Steve was born a male with an extra X chromosome on the 23^rd pair. As result, he has reduced masculine characteristics, enlarged breasts, and is obese and excessively tall. Which disorder is likely to be diagnosed?

A) PKU
B) Down
C) Klinefelter's
D) Turner's

Klinefelter's syndrome is caused by an extra X chromosome in males (XXY). The individual may have reduced masculinity, enlarged breasts, obesity, and excessive height. PKU (A) is a genetic disorder where the body cannot process phenylalanine, resulting in intellectual disability if not treated early. Down syndrome (B) is caused by having an extra copy of chromosome 21 and is characterized by intellectual disability and distinct facial features. Turner syndrome (D) is a disorder where females are missing all or part of an X chromosome, which can result in short stature, infertility, and heart defects.