<prompt> Most common cause of delayed pubey in males is:Kallman syndromeKlinefelter syndromeConstitutionalPrader-willi syndrome  <response>: 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 