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
[{'content': 'In exposure and response prevention therapy which one of the following is a poor prognostic factor in OCD? \nSelect and explain. \nA. Magical thinking, B. Di contamination, C. Pathological doubt, D. Hoarding', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans:D. Hoarding.', 'role': 'assistant'}]