A. Elephant
B. Blue Whale
C. Shark
D. Giraffe
The blue whale is a marine mammal belonging to the suborder of baleen whales. At 30 metres (98 ft) in length and 180 metric tons (200 short tons) or more in weight, it is the largest known animal to have ever existed
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The correct answer to the question: "What is the world’s largest living mammal ?" is "Blue Whale".