Yes / no, is the following a verifiable fact?
"Wheat, a cereal grain, a worldwide staple food, is also an important source of carbohydrates."

Let me think out loud. Wheat is a grass widely cultivated for its seed as it is a food. The answer is yes.

Is the following a factual statement?
"Mail carriers on the Pony Express were all cowboys in classic chaps and hats."
Options:
- yes
- no

Let me think out loud. Although some were, this is a vast generalization. The answer is no.

Yes / no, is the following a verifiable fact?
"Traits of Narcissism are often associated with self-righteousness and selfishness."
Let me think out loud. This is along the lines of the definition of narcissism. The answer is yes.