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: Physiology
Which of the following hormones has a permissive action at the onset of pubey? 
Select and explain. 
A. Insulin, B. Leptin, C. GnRH, D. Growth hormone
B: Leptin
Answer: B: Leptin 
Explanation: Ans: B. LeptinRef: Ganong 25/e p397, 24/e p399; Knobil and Neill's Physiology of Reproduction 2014/p1607; Novaks 13/e p410).Leptin has a permissive action at the onset of pubey.