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
Most sensitive test for microfilariae? 
Select and explain. 
A. DEC challenge test, B. Immunofluorescence test, C. Thick films, D. Membrane filter concentration technique
D: Membrane filter concentration technique
Answer: D: Membrane filter concentration technique 
Explanation: 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