Which structure is found in the phylum Platyhelminthes to attach to the host?

What are the peculiar features that you find in parasitic platyhelminthes?

Rhabdites occur in

“Triploblastic,unsegmented,acoelomate exhibiting bilateral symmetry and reproducing both asexually and sexually with parasitic forms.” The above description is characteristic of which phylum?

Given below are two statements.
Statement $I$: Cephalic ganglion appears like $U$ shaped structure in Hydra.
Statement $II$: Ventral nerve cords are connected to each other by commissure in a ladder like manner in Planarian.
In the light of above statements,choose the most appropriate answer from the options given below:

Platyhelminthes are called as