context: From January 1975 to November 2009, the chairman of the European Board of Directors was a system of sequential chairmanship replaced by the head of state or head of government of the chairman of the Council of the European Union after six months of office, but was not an official position. On December 1, 2009, the Lisbon Treaty came into force and was upgraded to an official position, with a term of two years and six months. The current chairman of the European Board of Directors is Donald Tusk from Poland, who took office on December 1, 2014.
question: Who is the current chairman of the European Union?
answers.text: Donald Tusk