Oncept essay on attention deficit disorder (ADD)

I need a concept paper on attention deficit disorder.
These were the instructions on Blackboard:
Write an essay about a concept that interests you and that you want to study further. When you have a good understanding of the concept, explain it to your readers, considering carefully what they already know about it and how your essay might add to what they know.
My professor said to only use one source and to have a work cited page.