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: Medicine
Delusions are seen in all of the following except: 
Select and explain. 
A. Obsessive compulsive disorder, B. Depression, C. Mania, D. Schizophrenia
A: Obsessive compulsive disorder
Answer: A: Obsessive compulsive disorder 
Explanation: None