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The answer is letter C.

Anaphylaxis
is a life-threatening allergic reaction. This is cause by hypersensitivity to
allergens, usually through food or air pollutants by way of ingestion. Signs of
anaphylaxis include, inability to breathe, tightening of the airway, and red
spots on the skin. Upon the onset of this condition, medications must be
administered to prevent further effects of hypersensitivity. If medications are
not available, the person will need immediate professional help. If left untreated the
person may lack oxygen in the brain which may lead to possible death.  

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