This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
The organism most commonly causing genital filariasis in most pa of Bihar and eastern 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: - lymphatic filariasis is the infection caused by nematode worms. - bancroftian filariasis affects the genitals while brugian filariasis rarely involve genitals. - among 95 percent of lymphatic filariasis is caused by Wuchereria bancrofti and the heavily infected states in India include Uttar Pradesh , Bihar, Orissa, Andra Pradesh. Reference : Park's textbook of preventive and social medicine, 23rd edition pg no:270 <\p>