(B) $Hymenolepis nana$ belongs to the class $Cestoda$ and is commonly known as the dwarf tapeworm. It typically measures about $2-4.5 \ cm$ in length.

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(B) $Hymenolepis nana$ belongs to the class $Cestoda$ and is commonly known as the dwarf tapeworm. It typically measures about $2-4.5 \ cm$ in length. The life cycle of $Hymenolepis$ is monogenetic,meaning it completes its entire life cycle within a single host.