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
The presence of delusion, hallucination and disturbed cognitive functions indicate: 
Select and explain. 
A. Paranoid Psychosis, B. OCD, C. Dissociative disorder, D. Organic Brain Syndrome
D: Organic Brain Syndrome
Answer: D: Organic Brain Syndrome 
Explanation: C i.e. Organic brain syndrome