This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
The organism most commonly causing genital filariasis in most pa of Bihar and easteran U.P is - 
Select and explain. 
A. Wuchereria bancrofti, B. Brugia malayi, C. Onchocerca volvulus, D. Dirofilaria
A: Wuchereria bancrofti
Answer: A: Wuchereria bancrofti 
Explanation: repeated leakage of lymph into tissues first leads to lymphoedema and then to elephantiasis of one or more limbs,breast,penis,scrotum or vulva The development of lymph scrotum results in chyluria,hydrocoele,orchitis,funiculitis (Refer pgno:168 baveja 3 rd edition)