The correct option is C Excretory system consists of flame cells
The excretory system in Annelida consists of nephridia.
Flame cells are part of the excretory system of animals belonging to phylum Platyhelminthes.
Phylum Annelida includes bilaterally symmetrical, triploblastic, coelomate and metamerically segmented animals. They have both monoecious and dioecious animal representatives and do not have sexual reproduction. Blood vascular system is of the closed type.