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
[{'content': 'Increase in cAMP is caused by: \nSelect and explain. \nA. Somatostatin, B. β (Beta) receptor, C. α (Alpha) receptor, D. Acetylcholine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]