A) Chelone, Calotes, Naja
B) Pavo, Psittacula, Ornithorhynchus
C) Cams, Felis, Rattus
D) Bufo, Rana, Hyla
Correct Answer: B
Solution :
Pavo, Psittacula, Omithorhynchus are odd ones as, Pavo and Psittacula belong to class-Aves, whereas Omithorhynchus belongs to class-Mammalia of phylum-Chordata.
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