Yes / no, is the following a verifiable fact?
"Wheat originated in China and spread westward through Europe and then to North America." The thought process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Wheat originated near Turkey and did not reach China until much later.
Therefore, the answer is no.