Yes / no, is the following a verifiable fact?
"Casablanca contains over 3 million people and is the largest city of Morocco." 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
Casablanca is a municipality and regional capital of Morocco.
Therefore, the answer is yes.