What cause's "US" to sneeze?!

Question: What cause's "US" to sneeze!?
Answers:

all it is, a particle of something (dust, allergen, pollen, whatever) which irritates the nasal mucosa or any part of the upper respiratory tract and triggers the sneeze which helps to blow out the particleWww@Answer-Health@Com

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What cause's "US" to sneeze?!

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