{"slug":"","question":"Which extinct saber-toothed cat was the largest, at up to 400 kg?","topic":"EXTINCT LINEAGES","answer_a":"Smilodon fatalis","answer_b":"Homotherium serum","answer_c":"Smilodon populator","answer_d":"Machairodus giganteus","correct_index":2,"fact":"Smilodon populator roamed South America and reached ~400 kg — larger than any modern big cat, including Siberian tigers. Its canines were up to 28 cm long."}