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: Pharmacology
Which of the following is used to treat Laron's dwarfism 
Select and explain. 
A. Sermorelin, B. Tesamorelin, C. Mecasermin, D. Ganirelix
C: Mecasermin
Answer: C: Mecasermin 
Explanation: Mecasermin is IGF - 1 analogue used to treat Laron dwartism. Laron syndrome is characterized by mutation of growth hormore receptor and hence growth hormone analogues can not be used.