Is the following a factual statement?
"Hounds purr when you scratch them behind the ears."
Options:
- yes
- no
no
Hounds are a type of dog, they don't purr like cats.

Is the following sentence factually correct?
"Justin Bieber sings pop music and he originates from Canada."
Options:
- yes
- no
yes
This is true because one can stream his albums online.

Claim: "Dextromethorphan suppresses persistent cough conditions caused by throat and/or bronchial irritation."
Is the claim above correct, and can it be verified by human common sense and without a web search?
Options:
- yes
- no
yes
Cough suppression is the primary reason for the usage of the dextromethorphan drug.

Is the following sentence factually correct?
"Recent studies have found that Substance dependence is decreasing all over the world."
Options:
- yes
- no
no

Substance dependence is not decreasing everywhere, in some places it is rising significantly.