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
Delusion is a disorder of? 
Select and explain. 
A. Thought, B. Personality, C. Memory, D. Cognition
A: Thought
Answer: A: Thought 
Explanation: Ans. (a) ThoughtRef. Kaplan 9th ed. /281