River blindness is caused by :: (A) Drinking river water without boiling., (B) Oncocerca volvulus, (C) Toxoplasma canis, (D) Glaucoma
Answer is B. Ans. is 'b' i.e. Onchocerca volvulus Onchocerca volvulus is transmitted by Simulium damnosum, a black fly* that breeds in areas of rapidly flowing streams thus the term 'river blindness9T/t by Ivermectin*