Which of the following is a correctly matched pair?

Select the incorrect match$-$

Identify the odd one out.

Given below are two statements:
Statement $I$: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.
Statement $II$: In phylum Echinodermata, both adults and larvae are radially symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below:

$S$ - Statement: In $Ascaris$,excretion occurs through flame cells.
$R$ - Reason: Platyhelminthes possess a complete digestive system.

Which one of the following pairs of animals are similar to each other for the feature stated against them: