The correct option is D Dracunculus medinensis
Nematodes are roundworms and belong to the phylum Nematoda and more than half of the identified species are parasites on plants, animals and even humans. Dracunculus medinensis ( Guinea worm) is a large, thin and threadlike nematode growing up to 1 m long was recorded by the early Egyptian physicians between 1553- 1550 BC , the information which was obtained by the German Egyptologist in 1872.