Whoa! A "simple" talking robot? Wow, that seems like an oxymoron to me! Legos has great robot kits of all types, don't know if any are able to talk however. I suppose the simplest mechanism is to store phrases of speech in a memory device like an SD card as used in digital cameras, but evoking the right phrases for particular questions, well, that would be a challenge indeed. Sorry I couldn't be of more help.