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"Many people have allergies, and those of you who don't have them yet, you may develop some. Close your books and tell me, who knows what an allergy is?" She said and began petting her Mephisto.
Minerva put up her hand. "Professor I think an allergy is when the body is rejecting something it feels is dangerous to the body." she wasn't sure, but remembered seeing her cousin puff up from a bee sting once. That looked like the body was rejecting the sting.