<prompt> Aerial blood gas analysis in Carbon monoxide poisoning shows:PO2 less, O2 saturation normalPO2 normal, O2 saturation less with normal or slightly decreased PCO2PO2 less, O2 saturation normalPO2 less, O2 saturation decreased  <response>: B i.e. PO2 normal O2, saturation less with normal or slightly decreases PCO2. 