Given the reference text about Mother Teresa's international charity, how many languages did Mother Teresa speak?

Mother Teresa said, "By blood, I am Albanian. By citizenship, an Indian. By faith, I am a Catholic nun. As to my calling, I belong to the world. As to my heart, I belong entirely to the Heart of Jesus." Fluent in five languages – Bengali, Albanian, Serbian, English and Hindi – she made occasional trips outside India for humanitarian reasons. At the height of the Siege of Beirut in 1982, Mother Teresa rescued 37 children trapped in a front-line hospital by brokering a temporary cease-fire between the Israeli army and Palestinian guerrillas. Accompanied by Red Cross workers, she travelled through the war zone to the hospital to evacuate the young patients. When Eastern Europe experienced increased openness in the late 1980s, Mother Teresa expanded her efforts to Communist countries which had rejected the Missionaries of Charity. She began dozens of projects, undeterred by criticism of her stands against abortion and divorce: "No matter who says what, you should accept it with a smile and do your own work." She visited Armenia after the 1988 earthquake[60] and met with Soviet Premier Nikolai Ryzhkov. Mother Teresa travelled to assist the hungry in Ethiopia, radiation victims at Chernobyl and earthquake victims in Armenia. In 1991 she returned to Albania for the first time, opening a Missionaries of Charity Brothers home in Tirana. By 1996, the Missionaries of Charity operated 517 missions in over 100 countries. The number of sisters in the Missionaries of Charity grew from twelve to thousands, serving the "poorest of the poor" in 450 centres worldwide. The first Missionaries of Charity home in the United States was established in the South Bronx area of New York City, and by 1984 the congregation operated 19 establishments throughout the country.

Mother Teresa was fluent in five languages, namely Bengali, Albanian, Serbian, English and Hindi.