The canonical flowchart for whether a question should be answered or closed as off-topic is featured in the blog post "Are Some Questions Too Simple?":
If you do a web search for the question is the answer in the first few results?
Yes, it is.
Is the answer too slow to load, too hard to parse, or otherwise in need of improvement?
The first hit, while not from a canonical source, was quick to load and provided a great, easy to read overview of the possible candidates. If you don't like that answer, the Wikipedia article on the subject is the 4th hit, and is what was quoted as an answer.
Is the question basic, trivial, or is it complex and interesting for experts?
This is a toss-up. While it's an interesting question for experts (and there is no shortage of writings about the subject), if it's wholly answered by an excerpt from Wikipedia, I would consider it to be trivial.
So I'd consider this question borderline, and one of the cases where the answers, not the question content, determine if the question is viable here. If I had to choose, I'd say the answer quoting Wikipedia should be deleted and see what answers come in.