This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
Stimulates the production of IGF. 
Select and explain. 
A. LH, B. PRL, C. TSH, D. GH
D: GH
Answer: D: GH 
Explanation: GH stimulates the release of IGF by the liver and other tissues. The other hormones listed do not stimulate IGF release from any tissue.