In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

[EX Q]: Passage: Duan Ju was born in Tianjin. At the age of 17, he was called up to China youth football team. Duan Ju played for Tianjin football Team 2 from 1980 to 1983. From 1984 to 1991, Duan Ju played for Tianjin. In 1988, Duan Ju played for China in the 1988 Asian Cup and football match at the 1988 Olympic Games. In 1990, China lost to Thailand in football match at the 1990 Asian Games. The coach of China, Gao Fengwen quit office, then Duan Ju quit the China national team and returned to Tianjin. in 1992, Duan Ju had gone to Japan and played for NKK SC. In 1993, Duan Ju retired in Japan and returned to China. In 1995, Duan Ju played for Tianjin Yuancheng football club, in the same year, Duan Ju retired again.
Link Information: none Question: What coach did Duan Ju play for on the Japanese team?
[EX A]: Answer: none

[EX Q]: Passage: Benny Moldovanu earned a BSc and MSc in mathematics from the Hebrew University of Jerusalem in 1986 and 1989, respectively, the latter under the supervision of Bezalel Peleg. He then obtained a PhD in economics from the University of Bonn, with future Nobel Memorial Prize winner Reinhard Selten as advisor, in 1991 and habilitated there in 1995. Having worked as assistant professor of economics at the University of Bonn after his PhD (199195), he then became full professor at the University of Mannheim (19952002) before returning to the University of Bonn in 2002, where he has worked ever since. At Bonn, he has been the Co-Director and later Academic Director of the Bonn Graduate School of Economics (200613) as well as Co-Director of the Hausdorff Center for Mathematics (200613), where he today leads the research area on mechanism design and game theory.. Moreover, at Bonn, Moldovanu is currently Director of the Institute of Microeconomics (since 2012) as well as of the Reinhard Selten Institute for Research in Economics (since 2017). Throughout his professional career, Moldovanu has held visiting appointments at the University of Michigan, Ann Arbor, Northwestern University, University College London, Yale University, Tel Aviv University, and the Hebrew University of Jerusalem. In terms of professional activities, he has been a member of the Councils of the European Economic Association and Game Theory Society, is a research fellow at the Centre for Economic Policy Research (CEPR), and has chaired the Scientific Committees of the Econometric Society and German Economic Association. Finally, he has performed editorial duties for Econometrica, Journal of the European Economic Association, Games and Economic Behavior, Journal of Economic Theory, and Economic Policy.
Link Information: It was founded on December 29, 1930 Question: Of the organizations Benny has chaired, which one is older?
[EX A]: Answer: German Economic Association

[EX Q]: Passage: The garden already existed at least in the early 18th century. During the Austrian occupation of northern Serbia 1717-39, several hospitals were established in Belgrade, including the Great military hospital. Based on the Austrian plans, the hospital was set outside of the Belgrade Fortress ("Danubian" or "German Belgrade"), in the Serbian part of the city. As shown on the map of Belgrade by Nicolas Francois de Spar, the Tsarigrad Road began at the Wurttemberg Gate (Stambol Gate), at the modern Republic Square, and headed towards "Marko's cemetery" in Tasmajdan. The hospital was situated on the road's right side, where the modern Stari Dvor is located. Behind the hospital there was a large garden, predecessor of the modern park, and further behind it, across the road was the military cemetery. Later "Marko's market" developed on the spot and today it is the area surrounding the House of the National Assembly of Serbia. After Austria lost the Austro-Turkish War of 17371739, the northern Serbia, including Belgrade, was returned to the Turks. One of the provisions of the 1739 Treaty of Belgrade stated that Austria had to demolish all the fortifications and military and civilian buildings it has constructed during the occupation. Many Baroque buildings were demolished. However, Austria didn't demolish the buildings outside of the fortress walls, including the Great military hospital, which, albeit as a ruin, survived until the next Austrian occupation in 1788.
Link Information: The Treaty of Belgrade, known as the Belgrade peace was the peace treaty signed on September 18, 1739 in Belgrade, Habsburg Kingdom of Serbia (today Serbia), by the Ottoman Empire on one side and the Habsburg Monarchy on the other Question: How many countries total were included in the Treaty?
[EX A]:
Answer: 2