Step-by-step reasoning process: Jack Dempsey died in 1983. Conor McGregor's first MMA fight was in 2008.
The question and answer:
Question and answer: Did Jack Dempsey ever witness Conor McGregor's fights?
no

Step-by-step reasoning process: Salmon reproduce in freshwater. The Caspian Sea is a saltwater lake.
The question and answer:
Question and answer: Do salmon mate in the Caspian Sea?
no

Step-by-step reasoning process: Oysters produce nacre. Nacre is also known as mother of pearl. Mother of pearl is commonly used as an inlay on guitar fretboards, headstocks, and soundboards.
The question and answer:
Question and answer: Can oysters be used in guitar manufacturing?
yes

Step-by-step reasoning process: The first Vice President of the United States was John Adams. The Ottomans were a Turkic group that conquered Constantinople in 1453. John Adams was descended from English Puritans.
The question and answer:
Question and answer:

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
Was the first Vice President of the United States an Ottoman descendant?
no