Yes / no, is the following a verifiable fact?
"Duke Ellington fame came from his innovative rap style." 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
Duke Ellington was famous for his big band and jazz music. He was not a rapper.
Therefore, the answer is no.