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: Forensic Medicine
[{'content': 'Fatal dose of Pottasium cyanide is: \nSelect and explain. \nA. 5 mg, B. 10 mg C, C. 20 mg D., D. 200 mg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 200 mg', 'role': 'assistant'}]