If strong oxidizers get into the bloodstream, a methemoglobin is formed. It is a compound, where iron (II) becomes iron (III). What has to be done to save the patient?

Answer options

1. Interchangeable hemotransfusion has to be done
2. Patient has to be exposed to the fresh air
3. He has to be calmed down and put to bed
4. Respiratory centers have to be stimulated
5. He has to be given pure oxygen