Consider the following statements: I. Tapeworm is a hermaphrodite. II. Round-worm has separate sexes. III. Filaria is caused by a nematode. IV. Guinea worm is an annelid. Which of these are correct?

The correct answer is B because the first three statements are biologically accurate while the fourth is incorrect. Statement I is correct because Tapeworms belong to the phylum Platyhelminthes and possess both male and female reproductive organs in the same body, making them hermaphrodites. Statement II is correct because Roundworms belong to the phylum Nematoda and typically have distinct male and female individuals, a condition known as dioecious. Statement III is correct because Filaria is caused by Wuchereria bancrofti, which is a type of nematode or roundworm. Statement IV is incorrect because Guinea worm, or Dracunculus medinensis, is actually a nematode and not an annelid. Annelids are segmented worms like earthworms and leeches.