Human: What are the different types of phobias? Assistant: 
There are several different types of phobias. Specific phobias involve an intense fear or dread of a certain object, situation, or activity. Social phobia is characterized by extreme anxiety in social situations. Agoraphobia involves a fear of public places and open spaces. Panic disorder involves sudden attacks of overwhelming fear and anxiety that can lead to physical symptoms such as chest pain, shortness of breath, dizziness, or nausea. Obsessive-compulsive disorder (OCD) is characterized by unwanted thoughts or behaviors that are intrusive and distressing.