Ans: B. M2Methacholine is an M2 receptor agonist.ParameterM1M2M3Agonists (Relatively selective)Oxotremorine, MCN-343AMethacholineBethanecholAntagonists (Relatively selective)Pirenzepine, TelenzepineMethoctramine, TripitramineDarifenacin, Solifenacin
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