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
Delusion is a disorder of: Al 07; Gujarat 07; MP 11; Bihar 12 
Select and explain. 
A. Thought, B. Perception, C. Insight, D. Cognition
A: Thought
Answer: A: Thought 
Explanation: Ans. Thought