Answer:
When an employer asks this question, they are really asking two separate questions:
1) Do you have goals/dreams/aspirations?
2) Are your goals/dreams/aspirations in line with this company?
With that in mind, you need to decide what about this job IS relevant to your 5-year plan and communicate it.
Answer
I would explain how I plan to use this job as a rung in the ladder to other achievements.
Answer
By asking this question, employers are basically filtering those employees who have a clear mindset about what they wish to accomplish and by what means i.e a career plan in order to achieve career goals and objective. Answer this question by saying " I see myself progressing in my field as well as in the company, learning new skills to the benefit of the company. I find this job very challenging and motivating. I can see many challenges ahead and therefore, willing to invest my five years time learning all aspects of the job towards professional advancement. "