<prompt> Methemoglobinemia can be treated by:Methylene blueVitamin KVitamin AAll of the above  <response>: Hepatic metabolism of prilocaine generates O-toluidine, which oxidizes hemoglobin to methemoglobin. Methemoglobinemia, if severe, may be treated by the intravenous administration of methylene blue Ref: Millers anesthesia-7th ed, Chapter 30. 