Step 1: Identify the nature of phobias and OCD.
Both phobias and Obsessive Compulsive Disorder are characterized by excessive fear, anxiety, and avoidance or compulsive behaviors. Step 2: Match with diagnostic categories.
These features place both conditions within the category of anxiety disorders. Step 3: Eliminate incorrect options.
Mood disorders primarily involve disturbances of mood such as depression or mania.
Somatoform disorders involve physical symptoms without medical cause.
Psychotic disorders involve loss of contact with reality. Step 4: Conclusion.
Hence, the correct answer is anxiety disorders.