Dust...

I saw on the medical form a question specific to dust. I believe it was sensitivity to dust. Dust is an allergen for my DS. Not sure I understand the difference to sensitivity to dust vs checking yes for allergic rhinitis and listing dust as a trigger (allergies are well controlled with otc medicine).
Any advice? I figure the fewer "yes" answers the better so don't want to check yes to any more boxes than absolutely necessary.
Thanks