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
All are examples of form of thought disorder except 
Select and explain. 
A. Obsessive compulsive Neurosis, B. Delusion, C. Schizophrenia, D. Loosening of association
B: Delusion
Answer: B: Delusion 
Explanation: B. i.e. Delusion