Refer to the given passage and answer the following questions. P, Q and R are acoelomate organisms whereas S and T are true coelomates. P possesses cellular level of body organisation whereas others possess tissue and organ level of body organisation. Q possesses special stinging cells called cnidoblasts. R is the first triploblastic animal and has flame cells as excretory organs. The body of S is metamerically segmented whereas T bears jointed appendages and chitinous exoskeleton.
Select the option that correctly identifies organisms P, Q, R, S and T.
