To answer this question, you need basic knowledge about the extinction status of the given animals.
Option A) Cheetah - This option is correct because cheetahs are not extinct. They are still living in the wild and in captivity.
Option B) Dodo - This option is incorrect because the dodo is extinct. The dodo was a flightless bird that lived on the island of Mauritius and became extinct in the late 17th century.
Option C) Brontosaurus - This option is incorrect because the brontosaurus is extinct. The brontosaurus was a large herbivorous dinosaur that lived during the late Jurassic period, approximately 150 million years ago.
Option D) Mammoth - This option is incorrect because mammoths are extinct. Mammoths were large, hairy elephants that lived during the Ice Age and became extinct around 4,000 years ago.
The correct answer is Option A) Cheetah. This option is correct because cheetahs are not extinct and can still be found in certain parts of Africa and Iran.