This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Glycogenolysis is mediated by: \nSelect and explain. \nA. Alpha 1 receptor, B. Alpha l+beta2 receptor, C. Beta 2 receptor, D. Alpha 2 + beta 1 receptor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b (Alpha 1 + beta 2 receptors) Ref: Katzung, 10th ed, p. 130Glycogenolysis is mainly mediated by beta 2 receptors in the liver, but role of alpha 1 receptors have been mentioned in Katzung.Relative selectivity of adrenoceptor agonists. Relative Receptor AffinitiesAlpha agonists Phenylephrine, methoxaminea, > a 2 >>>>> bClonidine, methylnorepinephrinea 2> a1 >>>>> bMixed alpha and beta agonists Norepinephrinea1= a 2; b,>> b 2Epinephrinea1= a 2; b,= b 2Beta agonists Dobutamine b1 > b 2>>>> aIsoproterenol b1 = b 2>>>> aTerbutaline MetaproterenolAlbuterolRitodrine}b 2 >> b1>>>> aDopamine agonists Dopamine D1 =D2 >> b >> aFenoldopam D1 >> D2', 'role': 'assistant'}]