Kallu, a 30 year old man, presented with subcutaneous itchy nodules

Kallu, a 30 year old man, presented with subcutaneous itchy nodules over the left iliac crest. On examination, they are firm, non tender and mobile .Skin snips contain microfilaria and adult worms of


 a) Loa Loa 
 b) Onchocerca volvulus
 c) Brugia malayi 
 d) Mansonella perstans


Ans (b)