<prompt>  A patient ingested some unknown substance and presented with myoclonic jerks, seizures, tachycardia and hypotension. ECG shows a heart rate of 120min. The arterial blood revealed a pH of 7.25, pCO2 of 30 mm Hg and bicarbonate ions are 15 mmolL. The most likely poisonous agent is:Amanita phalloidesEthylene glycolImipraminePhencyclidine 