This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance abuse, Subject name: Psychiatry
[{'content': 'Drugs which cause both physical and psychological dependence are \nSelect and explain. \nA. Morphine, B. Alcohol, C. Nicotine, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All the above-mentioned drugs produce both physical and psychological dependence in varying degrees Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 326', 'role': 'assistant'}]