Answer:
It is a question that is asking you, "What makes you an expert on this subject? Please list any reasons or supporting documents."
Explanation:
It is asking if you have taken any special courses or classes on the subject. How much experience do you have in this subject?
Example: I am a nurse. I studied 4 years at a university and received my Bachelor's in Nursing Degree. Every 2 years I complete 20 hours of Continuing Education to keep my Nursing License and my knowledge up to date. I have been a nurse for 12 years.