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': 'Ligature pressure that should be used to resist spread of poison in elapidae poisoning: WB 11; MAHE 12 \nSelect and explain. \nA. < 10 mm Hg, B. 20-30 mm Hg, C. 50-70 mm Hg, D. > 100 mm Hg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. 50-70 mm Hg', 'role': 'assistant'}]