Use reasoning to lead to the answer of the following question:
Which of the following sentences is nonsensical?\nOptions:\n- Sentence A: "In some geological parks, we can appreciate dinosaurs and learn about their histories."\n- Sentence B: "Polar bear is a bear with white fur that lives in the tropics."\n

Sentence B
Dinosaurs lived in prehistoric times, but they are extinct now.

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The answer is Sentence B