Which chemicals cause allergy and how can the cause of allergy be determined?

  • A
    Histamine and Serotonin; by exposing the patient to small doses of possible allergens.
  • B
    Adrenaline and Steroids; by blood test only.
  • C
    Antibodies and Antigens; by $X$-ray.
  • D
    None of the above; by physical examination.

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