This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
Males who are sexually underdeveloped with rudimentary testes and prostate glands, sparse pubic and facial hair, long arms and legs and large hands and feet are likely to have the chromosome complement of: 
Select and explain. 
A. 45, XYY, B. 46, XY, C. 47, XXY, D. 45, X0
C: 47, XXY
Answer: C: 47, XXY 
Explanation: Klinefelter syndrome. Extra X chromosome, so they are 47 XXY or 46XY/47 XXY mosaics. Male phenotype Hypogonadism | Secondary sexual characteristics Dispropoionately long arms and legs.