"Have you ever seen a doctor or other mental health professional to treat a mental illness." Might be worded slightly longer, but that's essentially what the question is asking.
When I got into a fight at college a four years ago, part of my sentencing was a stint in anger management. The doc said I didn't have anger issues, just thought I needed to exercise better judgement. Wrote a letter to the court reflecting this, done and done.
So, I would answer that question as "No." I saw the guy because the court ordered it, not because I had a mental illness. Is this the way the security guys will look at it, or am I "lying" by answering it that way? I asked my recruiter about it, and his response was to not disclose the anger management anywhere on my application at all. That seemed like bad advice, given that the anger management is part of the court case documents that the investigators will surely see.