This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Microbiology
[{'content': 'Most sensitive test for microfilariae? \nSelect and explain. \nA. DEC challenge test, B. Immunofluorescence test, C. Thick films, D. Membrane filter concentration technique', 'role': 'user'}, {'content': "Answer: D \nExplanation: Concentration techniques are used when microfilariae concentration is low. So, it is very sensitive test. Types: Knott's concentration technique Nucleopore filtration DEC provocation test", 'role': 'assistant'}]