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 of the following are formal thought disorder EXCEPT: 
Select and explain. 
A. Schizophrenia, B. Delusion, C. Loosening of association, D. Mania
B: Delusion
Answer: B: Delusion 
Explanation: Ans. B i.e. DelusionDelusion is a disorder of thought content (NOT a formal thought disorder/disorder of thought process)DelusionDisorder of thought;False unshaken belief not amenable to reasoningSchizophrenia- Formal thought disorderLoosening of association-Formal thought disorderMania-Stream of thought disorder