Due to which of the following reasons is allergy caused?

Options :
  1. inflammation of upper respiratory tract
  2. inhalation of pollens
  3. introduction of foreign material in the body
  4. antigen - antibody reaction
Answer and Explanation :-

Answer: Option 4

Explanation:

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Because I'm selfish. I'm a coward. I'm the kind of girl who, when she might actually be of use, would run to stay alive and leave those who couldn't follow to suffer and die.
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