Q: Yes / no, is the following a verifiable fact?
"Oliver Cromwell helped lead the revolution that ushered in England's Reformation period."
Chain-of-thought:

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
Oliver Cromwell is generally known as one of the leaders of the revolution and Reformation in England. The answer: yes.