Timothy's Wife Is Having Trouble Conceiving a Child Despite Reports

Multiple Choice

Timothy's wife is having trouble conceiving a child despite reports on her reproductive fitness being normal. However, on examining Timothy, the doctor determines that his testes are undeveloped, and that he has enlarged breasts. He also observes that Timothy is unusually tall, although his parents and grandparents are of short stature. The doctor informs Timothy that these symptoms are due to Timothy having an extra X chromosome, making him XXY instead of XY. Timothy most likely suffers from

A) Down syndrome.
B) Fragile X syndrome.
C) Klinefelter syndrome.
D) Turner syndrome.