Keefer hadn't known much about allergic reactions and thus had kept silent. He had long ago learned that it is better to stay silent in Potions than to guess and anger Lafay. Thus he had simply scribbled down the responses, crossing off those that weren't correct.

But this time he could make an educated guess. He raised both hands and waited for eye contact before beginning. "Professor, I see three possibilities that haven't already been mentioned. The first is Ashwinder eggs. These are used to cure ague, which involves something similar to an allergice reaction, if I remember correctly. Second is fluxweed, which enables rapid changes. And I would want my antidote to a reaction to work as quickly as possible." Some people may want to stay swelled up like a puffer fish, but he didn't.

"And lastly, I think murtlap essence could be an ingredient. It's generally used to reduce inflammation, and that is often a big problem with allergic reactions."