Lily didn't know what typically went into potions, yet, but she figured that it had to have something to do with the allergens that were up in the front of the classroom. So using her skills of deducing, Lily figured that a guess would be a good thing to do. So she raised her hand to answer the question. "Um, I think one thing you would put into the potion would be whatever any specific person is allergic to, maybe in a smaller quantity or lesser amount." That made sense to Lily especially if they were making a potion to deal with allergies.