See this is a common HR question you will get in most of the interview session. You can answer the question like " In my career, I am sure of one thing and that is I want to build a decent career in my current domain. My present job has shown me the path to move and attain what has been my long-term career objective. I have acquired the necessary skills to some extent as well as have got accustomed to the corporate way of working. I guess this job can help me set up a strong professional life foundation".
Hope you get some help out of this answer.