Task: Question Answering
Input (English): Passage: Tito carried on numerous affairs and was married several times. In 1918 he was brought to Omsk, Russia, as a prisoner of war. There he met Pelagija Belousova who was then thirteen; he married her a year later, and she moved with him to Yugoslavia. Pelagija bore him five children but only their son Žarko Leon (born 4 February, 1924) survived. When Tito was jailed in 1928, she returned to Russia. After the divorce in 1936 she later remarried. Question: Who was the only surviving child of Tito's?
Output (English): Žarko Leon