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': 'Diffusion of oxygen at the tissue level is affected in all the following poisonings except: \nSelect and explain. \nA. Carbon monoxide, B. Curare, C. Phosgene, D. Cyanides', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Curare', 'role': 'assistant'}]