<prompt> VMA is a metabolite of:AdrenalineThyroxineSerotoninGrowth hormone  <response>: Ans: a Adrenaline Ref: Vasudevan, 4th ed, p. 190; 5th ed, p. 205Epinephrine is metabolised by COMT and MAO; the end product is VMA.NorepinephrineBridge to PharmacologyNon selective MAO inhibitors :Phenelzine, tranyl cypromine, Iso carboxyzine.EpinephrineSelective MAO inhibitorMAO-I Type A:mainly in liver. But anywhere metabolises NE, 5HT, and tyramineE.g.: clorgyline, meclobemideMAO-I Type B:mainly in brain, metabolises DA, PhenylethylamineE.g.: Selegeline, deprenylCOMTMetanephrineMAOVMA 