This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
Males who are sexually underdeveloped with rudimentary testes and prostate glands, sparse pubic and facial hairs, long arms and legs and large hands and feet are likely to have the chromosome complement: 
Select and explain. 
A. 45XXY, B. 46XY, C. 47XXY, D. 46X
C: 47XXY
Answer: C: 47XXY 
Explanation: c. 47 XXY(Ref: Nelson's 20/e p 618-619)This is clearly a case of Klinefelter syndrome:The male has a normal external genitalia but there is microorchidism and decreased testosterone level.The male in Kleinfelter syndrome is tall with long arms and legs.