The title is the question. When I was actively studying with the Witnesses back in the mid 70's I was often asked that question. I guess it was a reflection of the crowd I was hanging around with and the fact that I was a friendly at the time, but on reflection I haven't been asked the question for eons. (Maybe I have that village-of-the-damned look on my face and just don't realise it? Or maybe something more mundane like my name being put on the local Kingdom Hall no-fly list as my Witness wife and I have moved from place to place? More like it.)
But I'm still wondering if it's still in use, and what kind of response you give to the question, or would give if presented the opportunity.
Example: What version of The Truth are you referring to?