Skills, experience, and value adding, in terms of additional abilities are the natural replies, and must be included in your answer. You need to prepare for this question. It's not a simple question, if you consider the basic requirements of any job. It's necessary to add the desirable skills, and personal expertise. It's also relevant to your other questions, so think of it as a general rehearsal, and somewhere you can put all the points you want to make in one place.