When asked about your long term plans, it is important to keep your answer in professional terms and present your wishes to progress within the professional field in question.
Explaining how your previous positions and the position you're currently applying for advance you towards your long term goals could be a good approach to such a question.
Example:
- In 5 years from now, I see myself progressing in the field I've been working in during the past 3 years. I find this field extremely interesting and I can see many challenges lying ahead which I am eager to approach.
- In 5 years, I see myself in a senior position, having more responsibilities, managing more people.
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