This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
NOT RELATED-PSYCHIATRY Delusion is the disorder of 
Select and explain. 
A. Thought, B. Perception, C. Always organic, D. Always psychiatric
A: Thought
Answer: A: Thought 
Explanation: DELUSION is false belief in something that is not true.Types of delusions are:1. Primary delusions (autochthonous delusions): Arise denovo, cannot be explained on the basis of other experiences or perceptions. They are characteristic of early schizophrenia.2. Secondary delusions: Commonest delusions seen in clinical practise and seen in many psychological disorders.Commonly seen delusions in schizophrenia are:1. Delusion of grandeur 2. Delusion of persecution 3. Delusion of reference 4.Delusion of control.