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Which capital city has the world's largest thermal water cave system?

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Source:

Choice "A": London % of users selected this choice.
Choice "B": Budapest % of users selected this choice.
Choice "C": Lisbon % of users selected this choice.
Choice "D": Paris % of users selected this choice.

Image credit: Marc Ryckaert (MJJR), CC BY 3.0, via Wikimedia Commons.