In addition to being honest, there may be questions that you don't know the full answer to, so in addition to providing an answer also mention how this is how you feel now and not fully sure if this will always be the answer. I think it is important to talk about where you see this in the future, how does it look 5 years, 20 years down the line (obviously this will change, but it gives perspective on the direction you want to go).
