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 KCN is ? \nSelect and explain. \nA. 50 - 60 mg, B. 120 -130 mg, C. 180 -190 mg, D. 280 - 300 mg', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 280 - 300 mg Fatal dose of hydrocyanic acid in the pure form is 50 - 60 mg while as sodium or potassium cyanide is 200 - 300 mg.", 'role': 'assistant'}]