In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: A continent is one of several very large landmasses of the world. Generally identified by convention rather than any strict criteria, up to seven regions are commonly regarded as continents. Ordered from largest in size to smallest, they are: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.
A:
where does africa rank among the seven continents in size