The captchas are cool. It is these darned trick questions that get me...
I mean, I never bought or used Nikon. So what do I know of the colour of the lens?
That should give you a gold plated approval already ... Stop messing about with those captchas.
So if asked "what is 2 and 2" the best answer is "it depends" (and that works for most questions too - try it out - you would be surprised...)
So is this an arithmetic question, is it a binary logic question, or is it just messing with your mind? I can elaborate - the answers are:
See, It is hard to answer such questions...