Discussion
Asphyxiants are chemicals that exclude :
Answer: A
Asphyxiants exclude oxygen.
Simple asphyxiants are gases that are not themselves very toxic but displace oxygen from the air breathed, so that the body is starved of it. Chemical asphyxiants, such as carbon monoxide and hydrogen cyanide, prevent the body from carrying or using oxygen. Either way, it is oxygen that is kept from the tissues.
Nitrogen, carbon dioxide and methane are themselves common simple asphyxiants in confined spaces such as sewers and silos, so they are what displaces oxygen, not what is excluded.
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