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 a disorder of? \nSelect and explain. \nA. Thought, B. Personality, C. Memory, D. Cognition', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) ThoughtRef. Kaplan 9th ed. /281', 'role': 'assistant'}]