Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: A rock band with a female vocalist might be performing without the vocalist singing.
 The 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.
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Given the sentence "A rock band with a female vocalist performs in the street with a white van in the background." is it true that "A woman is singing for people."?
The answer is it is not possible to tell