<prompt> Methemoglobinemia is caused by:PrilocaineRopivacaineBupivacaineProcaine  <response>: Ans. A PrilocaineRef: Katzung 11the p449The administration of large doses 10mgkg of prilocaine during regional anesthesia may lead to accumulation of the metabolite o-toluidine, an oxidizing agent capable of converting hemoglobin to methemoglobin.The treatment of methemoglobinemia involves the intravenous administration of reducing agents eg. methylene blue or ascorbic acid, which rapidly convert methemoglobin to hemoglobin. 