Yes / no, is the following a verifiable fact?
"Errol Flynn sold home owner's insurance for a living." 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
Errol Flynn was an actor (although he may have sold insurance prior to becoming famous).
Therefore, the answer is no.