Come up with a question and stream of consciousness reasoning that would justify this answer: yes

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.
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The question is: Was the subject of Parsifal taken from British folklore?
Stream of consciousness: Parsifal was loosely based on a poem about Percival. Percival was a Knight of the Round Table. King Arthur and the Knights of the Round Table were products of British folklore.
