This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special topics, Subject name: Forensic Medicine
[{'content': 'In limb what amount of pressure is applied to prevent venum migration in snake bite \nSelect and explain. \nA. <10 mm of Hg, B. 20-30 mm of Hg, C. 40-70 mm of Hg, D. >100 mm of Hg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pressure immobilisation technique: A bandage is applied over the wound which is loose enough to fit one finger in. The pressure of bandage should be maintained in 50-70 mm Hg. This procedure (Sutherland wrap) is to occlude the lymphatic circulation without impeding the aerial or venous flow. Ref: FORENSIC MEDICINE AND TOXICOLOGY DR PC IGNATIUS THIRD EDITION PAGE 520', 'role': 'assistant'}]