A breathing mask is used for keeping harmful particles from entering the respiratory system.
Allergies are a reaction of the immune system to harmful particles in the air.
A breathing mask can prevent an allergic reaction.
What can prevent an allergic reaction?
Options:
  chemical messengers
  prolactin release
  with their fur
  sweating
  Breathing mask
  deoxyribonucleic acid
  Cooking
  hormones