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 and avoidance of high bridges or expressway overpasses is indicative of a specific phobia. A phobia is an excessive and persistent fear of a specific object, situation, or activity that is out of proportion to the actual danger it poses. Mark's behavior is not indicative of obsessive-compulsive disorder, social anxiety disorder, or generalized anxiety disorder.

Although Mark Realizes That His Behavior Is Unreasonable,he Is So