Structures helpful for excretion and osmoregulation are (a) nematocysts(b) nephridia(c) comb plates(d) flame cells(e) spiculesChoose the correct answer from the options given below.

Flame cells (found in flatworms) and nephridia (found in annelids) help for excretion and osmoregulation. Nematocysts of cnidarians help in defence, anchorage and capture of the prey. Comb plates of ctenophores help in locomotion. Spicules constitute the skeleton of sponges.