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
If there is a Gs alpha subunit gain–of–function mutation,this results in: 
Select and explain. 
A. Decreased cAMP, B. Decreased IP3, C. Increased GTPase activity, D. Increased cAMP
D: Increased cAMP
Answer: D: Increased cAMP 
Explanation: None