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: Social & Preventive Medicine
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: Ans. is 'a' i.e., Wuchereria bancrofti W. bancrafti is the most widely distributed human filarial parasite.