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: Forensic Medicine
A person has recurrent intrusive thoughts which he thinks are irrational and wants to stop is: MAHA 12 
Select and explain. 
A. Compulsion, B. Obsession, C. Delusion, D. Hallucination
B: Obsession
Answer: B: Obsession 
Explanation: Ans. Obsession