So, what would you say is your greatest weakness?
This has always worked well for me for a few reasons 1) the honesty will show and be appreciated, building trust with your prospective employer and 2) they can make an inform decision as to how they can benefit from your future growth. Both parties win because expectations are set from the get go.
For example, I have a phone interview tomorrow, and I will probably talk about things I am trying to level up on (Angular 2, Laravel and Python/Flask etc) yet, I'm very familiar with javascript, OOPHP, and most of the front end stack.
If you try to fool them it will turn out bad for both in the long wrong. I actually prefer to take a code exam so they know exactly what my weaknesses and strengths are.
Hope this helps.