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 close of potassium cyanide is? \nSelect and explain. \nA. 5 mg, B. 10 mg, C. 20 mg, D. 200 mg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 200 mg REF: Textbook Of Forensic Medicine and Toxicology: Principles and Practice by Vij page 695 Fatal dose of cyanide: HCN gas - 100-200 ppm in air HCN liquid- 50-60 mg KCN, NaCN- 150-300 mg (200 mg as per Parikh)', 'role': 'assistant'}]