Select the correct statement with respect to carbon monoxide.

Carbon monoxide is poisonous gas. Since it combines with haemoglobin of blood and forming the stable carboxy haemoglobin complex irreversibly hence the oxygen transportation by haemoglobin decreases . Hence man dies in an atmoshere of high concentration of carbon monoxide. The antidote used for the poisonous effect of carbonmonooxide is carbogen  is a mixture ofcarboxy haemoglobin is 300 times more stable than Oxy haemoglobin