This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Fatal dose of arsenic in adults - \nSelect and explain. \nA. 40-60 mg, B. 20-30 mg, C. 60-80 mg, D. 100-200 mg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: fatal dose of arsenic trioxide is 100-200mg REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO303', 'role': 'assistant'}]