context: Liechtenstein participates in a customs union with Switzerland and designates the Swiss franc as the national currency. 85% of the country imports its energy. Liechtenstein is a member of the European Economic Area (EFTA), a bridge between the European Union and the European Union. Liechtenstein has a hospital at Lichtenstein Landspace in Waduz. The Factbook Purchasing Gross Domestic Product (GDP) is estimated at $ 4.978 billion, based on purchasing power parity, with a per capita income of $ 1,39,100 in 2009, which ranks high on the global list.
question: What is the currency of Liechtenstein?
answers.text: Swiss franc