Which of these classes of antibodies provides protection against an allergic response?

IgE doesn't protect from allergic responses. It is actually responsible for allergic responses. This question doesn't have a correct answer. The second paragraph of the explanation even confirms this

Anyone else think the last sentence was totally out of context? (If you made it through reading the whole explanation after the question!)

There's a delicate balance between things even non-specialists should know vs what specialists should. If you go beyond general knowledge, at least provide a 'learning' explanation of the answer. I didn't feel that I got much of a takeaway from this one.

Player #10230957, Agreed. Not easily accessible knowledge. I couldn't even find why they used those letters. (Maybe E for Ehrlich?)

Source? Wikipedia 🙄