A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
Nematodes, commonly called round worms, constitute the largest phylum nematoda of super phylum Aschelminthes. They are distinct from flatworm and tapeworms (platyhelminthes), in having a cylindrical body, a pseudocoel, and a complete digestive tract lined by endodermal epithelium. Majority of nematodes are free living but most of the flatworms are parasitic.
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