Zhenya had no idea, but she was finding some logic in why people were staying to add what the person was allergic to. But she raised her hand and said, "Professor, I'm sure something better to work in potions would be used, but how about an antihistamine ingredient? Muggles use them by themselves in medicine form, but perhaps we could add some of the active ingredients used in it. However, I don't know what those ingredients are," she said.