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
Increase in cAMP is caused by: 
Select and explain. 
A. Somatostatin, B. β (Beta) receptor, C. α (Alpha) receptor, D. Acetylcholine
B: β (Beta) receptor
Answer: B: β (Beta) receptor 
Explanation: None