This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 2 (Helminthology), Subject name: Microbiology
A child from Bihar comes with fever. Blood examination shows sheathed microfilaria with 2 nuclei in tail tip. The diagnosis is 
Select and explain. 
A. B. malayi, B. W. bancrofti, C. Loa loa, D. Oncocerca volvulous
A: B. malayi
Answer: A: B. malayi 
Explanation: 2 distinct nuclei in tail tip is seen in case of B. malayi B. malayi Tail often constricted 2 rounded Subterminal and terminal tail nuclei W. bancrofti Tail tapers to delicatepoint Tail Neuclei Do not extend to tip oftail terminal nucleuselongate Loa loa Neuclei Continuous to tip of tail Pointed tail Terminalnucleus elongate Oncocerca volvulous Terminal Neucleus Do not extend to tip oftail; Finely pointed tail