Python Selenium - Finding a dynamic word on a webpage

I'm trying to check if a word is or is not on a webpage by using Selenium on Python. The problem is the word is dynamic: it will only appear after I do some action (in my case, selecting an option on a dropdown list).

I've tried to use

"text" is in driver.page_source"

But it doesn't work: it will not detect my dynamic text (even though it detects other static texts).

I have no idea why it doesn't work.