<prompt> An unknown patients presents with his pyrexia, constricted pupils, hypotesion, cyanosis and stupor progressing to coma. Poisoning is due to:PhenobarbitoneCannabisDhaturaDiphenhydramine  <response>: A i.e. Phenobarbitone Among the given four options, only Phenobarbitone BarbiturateQ can cause constricted pupils. 