This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Established Infection, Subject name: Surgery
Filariasis is cuased due to lymphatic obstruction by - 
Select and explain. 
A. R vivax, B. V. bancrofti, C. C. sinerses, D. S. hemetabium
B: V. bancrofti
Answer: B: V. bancrofti 
Explanation: Ans. is 'b' i.e., V. bancrofti