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Which of the following statements concerning severe allergic reactions is true​?A) The quicker the onset of​ symptoms, the greater the likelihood of a severe allergic reaction.B) Allergies do not develop until a person is in his late teens to early 20s.C) A severe allergic reaction can be prevented by the use of an epinephrine​ auto-injector before exposure to the substance.D) A severe allergic reaction occurs only when the patient has never been exposed to the substance before.

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