Although Mark realizes that his behavior is unreasonable, he is so alarmed by high bridges or expressway overpasses that he avoids them by taking an unnecessarily lengthy route to and from work each day. Mark appears to suffer from

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Mark's fear of high bridges or expressway overpasses is excessive and causes him to resort to avoidance behaviors, which are indicative of a phobia. Obsessive-compulsive disorder involves intrusive and persistent thoughts or compulsive behaviors, which do not appear to be present in this scenario. A mood disorder involves changes in mood, such as depression or mania, which are not described in this scenario. Generalized anxiety disorder involves excessive and uncontrollable worry about various situations or events, which is not specific to high bridges or expressway overpasses as in Mark's case.

Although Mark Realizes That His Behavior Is Unreasonable, He Is