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: Microbiology
[{'content': 'A patient presents with headache, high fever and meningismus. Within 3 days he becomes unconscious. Most probable causative agent ? \nSelect and explain. \nA. Naegleria fowleri, B. Acanthamoeba castellani, C. Entamoeba histolytica, D. Trypanosoma cruzi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Naegleria fowleri Amongst the given options Naeglaria and Acanthamoeba cause amoebic encephalitis. "The prognosis of Naeglaria encephalitis is uniformaly poor, most patients die within a week". "Acanthamoeba encephalitis follows a more indolent course".', 'role': 'assistant'}]