Gee, how I wish I could click on "Toggle Spoiler Content" to read the answer without having to first "Reply to Message." (I believe this glitch has already been reported on the BWW Tech thread, hoping they can resolve the issue soon.)
BTW, this is a great quiz question. I never would have come up with the answer, despite being very familiar with the answer. (Doing my best here to keep this spoiler-safe.)