Q: "Solo involves at least two performers."
Is the above claim true?
Options:
- yes
- no
A: no
How to explain the answer: Solo (music) is a kind of performance involving only one player.

Q: Yes / no, is the following a verifiable fact?
"If one travels to Billings, Montana from South America, one heads south."
A: no
How to explain the answer: Montana is north not south of South America.

Q: Yes / no, is the following a verifiable fact?
"San Diego County California has over 3 million people."
A: yes
How to explain the answer: As of the 2010 census, the population was 3,095,313,[5] making it California's second-most populous county and the fifth-most populous in the United States.