Lol, if the issue I had a while ago, is the same you're having now i.e no above question other than username/password, then it's not fixed yet unfortunetly, even though I did PM Cas to report it.
If same issue, then go to registration page temporarilly(instead of current "you entered wrong password to many times" CAPTCHA page), in other tab/window, and find there the question to answer, which is missing on other page(tab/window).
If not that issue I explained above, then think a little harder on the answer, as not that difficult either, unless not knowing anything about such, or how to put it. I mean, think of the different answers that usually would be entered by people, and then think about the question to answer yourself, regarding that. Atleast, you should be able to Google the answer, I don't mean actual answer to captha per-say, but goggle each of the different types of answers people could be answering above question with, and then research each one to find the answer with, which should only take a couple minutes honestly, as not that many potential answers, when going by firstly the most popular.
I cannot help more than above when not privately and everyone to see. PM me if still in doubt, but please do make a concerned effort first though. Also, I will not give you the answer in PM either, but possibly a little more explenation, to help you help yourself. Though honestly I'm little unsure, because you only have one short post, as first post, and then this, which seems little fishy to me, so I'm not even sure I can help you more though and will think about that if that situation happens, but again, you should be able to answer regardless, if just using some effort/googling.
@all, mods, Cas, if I'm out of bounds above, and helping to much, then I'll delete post again of-course, so just give me a note or something if I'm out of line
Though did try not to be, but hard to judge imho when is overstepping or not. I know it's for hindering spam and is pretty succesfully at that, so I don't wanna interfere with that of-course.
Edit: You only registered 6 days ago, so have already answered the CAPTCHA once + already forgot password?! Sorry, I am too unsure to potentially help you more in PM, but regardless, I'm then pretty sure that your sole issue is the issue I also had I.e the CAPTCHA question was there at registration, but missing at the "to many failed logins" CAPTCHA page, which makes much more sence, and should make it a breeze then to overcome now.