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': 'One of the following activities is not mediated through β2 adrenergic receptors: \nSelect and explain. \nA. Stimulation of lipolysis, B. Increased hepatic gluconeogenesis, C. Increased muscle glycogenolysis, D. Smooth muscle relaxation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]