In which of the following Cloaca which is the posterior opening that serves as the only such opening for the intestinal, reproductive and urinary tracts is present?

[A] Aves only
[B] Aves & Amphibians
[C] Aves, Amphibians and Reptiles
[D] Pisces, Aves, Amphibians & Reptiles

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This question is part of UPSC Prelims Practice and Mock Tests membership programme.