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': 'Yawning is a feature of: \nSelect and explain. \nA. Alcohol withdrawl, B. Cocaine withdrawl, C. Cannabis withdrawl, D. Opoid withdrawl', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Opoid withdrawl', 'role': 'assistant'}]