Yes / no, is the following a verifiable fact?
"The European pine marten fur is white in color."
no
The European pine marten's fur is dark brown because it lives in a wooded area and has adapted to this.

Is the following a factual statement?
"The President signs many laws while in the Oval Office."
Options:
- yes
- no
yes
The Oval Office is the primary working space of the President.

Is the following statement true?
"Constantine the Great radically altered the development of the Roman Empire."
yes
By moving the capital from Rome to Constantinople, Constantine the Great had a huge impact on the Roman Empire.

Claim: "Greyhounds is a train company that transports passengers."
Is the claim above correct, and can it be verified by human common sense and without a web search?
Options:
- yes
- no
no
Greyhounds in this sense are referring to the dogs but also, Greyhound is a bus company, not a train company.