This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms & Signs , Subject name: Psychiatry
[{'content': 'Delusion is the disorder of: \nSelect and explain. \nA. Thought, B. Perception, C. Always organic, D. Always psychiatric', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (Thought)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 practice and many psychological disorders.Commonly seen delusions in schizophrenia are:1. Delusion of grandeur2. Delusion of persecution3. Delusion of reference4. Delusion of control.', 'role': 'assistant'}]