This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 1, Subject name: Forensic Medicine
[{'content': 'Respiratory failure occurs 1) 40 - 50 % of carboxy haemoglobin in blood in carbon monoxide poisoning 2) 70 - 80 % CO2 Concentration in carbon dioxide poisoning \nSelect and explain. \nA. Both are true, B. Both are false, C. 1 is true, 2 is false, D. 2 is true, 1 is false', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In CO poisoning, respiratory failure occurs at 70 - 80% of carboxyhemoglobin in blood In CO2 poisoning, respiratory failure occurs at 40 - 50% of CO2 concentration in blood Patient with 70-80 % of carboxyhemoglobin in blood presents in coma with depressed or absent reflexes, thready pulse, irregular respiration which results in death. EFFECTs OF CO INTOXICATION : 0-10% - No symptoms 10 - 20% - Mild head ache 20 -30% - Emotional instability 30 -40% - increase head ache, confusion 50 -60% - Mimics drunkenness >70% - coma, death', 'role': 'assistant'}]