<prompt> First step in management of CO poisoning is?Intravenous methylene blue100 oxygen therapyAscorbic acid administrationNone of the above  <response>: Ans. is b i.e. 100 oxygen therapy o First step is actually removal of the patient from the place of poisoning.o First step in clinical management is 100 oxygen by face mask.o IV methylene blue is the treatment choice if there is methemoglobinemia. 