This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Which of the following conditions is classified under anxiety disorders according to DSMIII - 
Select and explain. 
A. Obsessive compulsive disorder, B. Depression, C. Schizophrenia, D. Bipolar disorder
A: Obsessive compulsive disorder
Answer: A: Obsessive compulsive disorder 
Explanation: Anxiety disorders include : - 1) Panic disorder, 2) Agoraphobia, 3) Specific phobia, 4) Social phobia, 5) Obsessive compulsive disorder, 6) Post traumatic stress disorder, 7) Acute stress disorder.