This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pubey and Adolescent Health, Subject name: Pediatrics
Most common cause of peripheral precocious pubey in males? 
Select and explain. 
A. Congenital adrenal hyperplasia, B. Constitutional, C. Klinefilter's syndrome, D. CNS pathology
A: Congenital adrenal hyperplasia
Answer: A: Congenital adrenal hyperplasia 
Explanation: Most common cause of peripheral precocious pubey in males-Congenital adrenal hyperplasia Precocious pubey- onset of pubey <8 years (girls), <9 years (boys) MC cause of central precocious pubey boys - CNS pathology (hypothalamic hemaoma) girls - idiopathic MC cause of peripheral precocious pubey boys - CAH girls - ovarian causes MC cause of delayed pubey both in boys & girls- constitutional growth delay