So my just-to-verify-you-aren't-a-machine question for registration was "Do dogs have one or two heads"? I had thought this was a just for fun type question so I wrote "They have three heads!". Apparently it wasn't such so I got it wrong. (that smiley is ridiculous, I just had to use it)
there are too many answers to that question. Think about it, Hades' (and Hagrid's) dogs had three heads! No they aren't real but this IS a fantastical forum. Also our brain's are divided into our subconscious and conscious minds, it is the same for dogs too (they dream) so simplistically... two heads.
things get interesting when you over think them
Oh and the second question I had to answer was "what is the second letter of the alphabet". I wrote B, but even this answer isn't the sole option...