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': 'All the following are criteria to say substance dependence except \nSelect and explain. \nA. Tolerance, B. Withdrawal symptoms, C. Unable to quit the drug, D. Use of illegal substances', 'role': 'user'}, {'content': "Answer: D \nExplanation: Usage of illegal drugs doesn't come under substance dependence as per WHO definition. Remaining 3 options make up the definition Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 326", 'role': 'assistant'}]