Which one is not a national currency?

Which one is not a national currency? Correct Answer Euro

A currency in the most specific sense is money in any form when in use or circulation as a medium of exchange, especially circulating banknotes and coins. A more general definition is that a currency is a system of money (monetary units) in common use, especially for people in a nation. Under this definition, U.S. dollars (US$), euros (€), Japanese yen (¥), and pounds sterling (£) are examples of currencies.
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