This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
A most common cause of delayed puberty in males is – 
Select and explain. 
A. Kallaman syndrome, B. Klienfelter syndrome, C. Constitutional, D. Prader–willi syndrome
C: Constitutional
Answer: C: Constitutional 
Explanation: Most common cause of delayed puberty is constitutional.