The Bitcoin whitepaper was published in 2008 by a person or group called Satoshi Nakamoto.
Why it is true
The document describing Bitcoin, titled Bitcoin: A Peer-to-Peer Electronic Cash System, was published in 2008 by Satoshi Nakamoto, whose real identity remains unknown to this day. The Bitcoin network began operating in 2009.
Source: Bitcoin.org
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.