Ari was lucky, not being allergic to anything, but she knew how hard it must be on people who do have such sort of sensitivities. Her favourite uncle was allergic to cats, and every time he visited, Ari had no choice but to hide her Pluto for the day. She didn't know how to define allergies, though. Nevertheless, after a bit of thought, she managed to order her ideas a bit.

'An allergy is a reaction some people have when in the proximity of animals, plants or objects that are normally harmless, because their body had developed a certain sensitivity. These reactions can be things like fever, itchiness or swelling.' the girl replied after having raised her hand.