River blindness is caused by:: (A) Onchocerca, (B) Loa Loa, (C) Ascaris, (D) B. malayi
Answer is A. Ans. is 'a' i.e., Onchocerca(Ref: Harrison, 19th/e, p. 1421)* Onchocerciasis is also known as River blindness Q and fly involved is Simulium fly.