Which carnivorous marsupial, native to Australia, is considered extinct?

The correct option is Thylacine.

Explanation

The question addresses the conservation status and taxonomy of specific terrestrial fauna, distinguishing between extinct and extant species within the marsupial infraclass.

• Thylacine is Correct: The Thylacine (Thylacinus cynocephalus), commonly known as the Tasmanian Tiger or Tasmanian Wolf, was the largest known carnivorous marsupial of modern times. Native to continental Australia, Tasmania, and New Guinea, it is officially classified as extinct. The last known specimen died in captivity in 1936.
• Quagga is Incorrect: The Quagga is an extinct subspecies of the plains zebra native to South Africa. It was a placental mammal, not a marsupial.
• Aurochs is Incorrect: The Aurochs is an extinct species of large wild cattle that inhabited Europe, Asia, and North Africa. It was a placental mammal.
• Wombat is Incorrect: The Wombat is a short-legged, muscular marsupial native to Australia. It is herbivorous and is an extant (living) species.

Key Takeaway: The Thylacine is the specific carnivorous marsupial native to the Australian region that has gone extinct in the 20th century.