The interviewer is trying to find out your key interests, and whether the job on offer has responsibilities you will dislike. Focus on what you particularly enjoyed in your last role and what you learned from it, drawing parallels to the new role. When addressing what you disliked, be conscious not to criticise your last employer. Choose an example that does not reflect on your skills (such as company size) or that reveals a positive trait (such as your dislike for prolonged decision making).