Office Girl Question:

Depending on the role and the level of the job, you don't have to pretend that you want to still be in it in five years. Most people want to grow in their careers, and five years has become a long time to stay in one position.
Instead explain how the job is the right move for your career growth at this time - and how your excelling at it would make both you and the employer more successful. Show how what you can accomplish, demonstrate and learn in this job takes you closer to where you want to go.

Don't say: In your job - Or - Successfully running my own (insert unrelated field) start-up company.