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A person will die of oxygen dificiency when under certain conditions his P50 value of Hb rises to 100 mm Hg, the reason being that:

[A].	He cannot load enough oxygen in the lungs	[B].	He can load enough oxygen but cannot unload it
[C].	He can neither load nor unload oxygen in the lungs	[D].	He suffers with degradation and cannot function normally

Answer: Option C