Prior to your interview, be sure to research the company you are interviewing with in detail to learn about potential growth opportunities in the future, if you are hired. If your interviewer is asking this question, it is very likely that they would prefer to hire a candidate with leadership skills and a desire to take on more duties in the short to long term within their organization. As you answer this question, be open and honest about your career goals in relation to being a leader and also really sell your interviewer on your long-term interest in working for the company. In the end, they will be looking to ensure that the person they hire will be in it for the long haul.