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: Pharmacology
[{'content': 'Opium is a derivative of: \nSelect and explain. \nA. Solanum tuberosum, B. Datura stromonium, C. Papaver somniferum, D. Nicotiana tobacum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]