This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Parkinsonism like features are evident in surviving patients of which poisoning - \nSelect and explain. \nA. CO, B. CO2, C. H2S, D. N2O', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CO poisoning symptoms- headache CNS-monoplegia,hemiplegia,personality changes,cerebellar damage,parkinsonism bullae CO automatism REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 359', 'role': 'assistant'}]