This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Pubey, Subject name: Pediatrics
Most common cause of delayed pubey in males is: 
Select and explain. 
A. Kallman syndrome, B. Klinefelter syndrome, C. Constitutional, D. Prader-willi syndrome
C: Constitutional
Answer: C: Constitutional 
Explanation: DELAYED PUBEY: More common in boys Delayed pubey in boys - lack of pubeal changes by 14 yrs of age Most common cause of delayed pubey is constitutional. Constitutional delay in pubey in boys: Have growth retardation & delayed bone age Family history of delayed pubey is present Gonadotropin levels - prepubeal - similar to hypogonadotropic hypogonadism