This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries, Subject name: Forensic Medicine
[{'content': '% of COHb that can cause death - \nSelect and explain. \nA. 70%, B. 82%, C. 75%, D. 80%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 82 % Symptoms of CO poisoningCOHb%Symptoms0-10%None10-20%Breathlessness on moderate exertion, headache, weakness20-30%Throbbing headache, irritability, defective memory, rapid fatigue30-40%Nausea, vomiting, dizziness, dimness of vision, confusion, cherry red color40-50%Increasing confusion, ataxia, rapid respirations & collapse with attempts at exertion. Symptoms resemble alcohol intoxication50-60%Coma with intermittent convulsions, tachycardia with weak pulse & red discoloration of skin60-70%Increasing depth of coma with incontinence of urine & feces70-80%Profound coma with absent reflexes, thread pulse, shallow' respirations & death>80%Rapid death from respiratory arrest.", 'role': 'assistant'}]