Select the option which shows correct combination of an organism and its feature.
The body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk in hemichordates (Balanoglossus).
Ichthyophis is a limbless amphibian.
Pila (Mollusca) is unsegmented.
Cucumaria (Echinodermata) lacks a specific excretory structure.