Tell me about your areas of improvement.

Here your interviewer is trying to find out your major weakness which holds you back is achieving anything.Here you need to share your weakness which is actually a good thing but still holding you back. This will show your effectiveness.
Example Answer: My biggest area of improvement would be that i spend too much time with non-performer in turning him a performer. Also, I easily relate with people which sometimes becomes my weakness as people start expecting a lot from me.