Answer the following question: Information:  - The Polish People's Republic (Polish: "Polska Rzeczpospolita Ludowa", PRL) covers the history of Poland under Communist control between 1952 and 1990. The name was defined by the Constitution of 1952 which was based on the 1936 Soviet Constitution. Between 1947 and 1952, the name of the Polish state was the Republic of Poland ("Rzeczpospolita Polska"), in accordance with the temporary Constitution of 1947. At the time of its founding during final stages of World War II, Poland was regarded as a puppet entity set up and controlled by the Soviet Union, and over time, it developed into a satellite state of the Soviet Union.  - Institute of High Pressure Physics , also known as Unipress ( Polish : Instytut Wysokich Cinie ) is a scientific institute founded in 1972 by the Polish Academy of Sciences ( PAN ) .  - A research institute is an establishment endowed for doing research. Research institutes may specialize in basic research or may be oriented to applied research. Although the term often implies natural science research, there are also many research institutes in the social sciences as well, especially for sociological and historical research purposes.  - The Polish Academy of Sciences (PAN), headquartered in Warsaw, is Poland's top academy of sciences. It is responsible for spearheading the development of science across the country by a society of distinguished scholars as well as a network of research institutes. It was established in 1951, during the early period of the Polish People's Republic following World War II.  - An academy of sciences is a type of learned society or academy (as special scientific institution) dedicated to sciences that could be or not state funded. Some state funded academies are tuned into national or royal (in case of the United Kingdom i.e. Royal Society of London for Improving Natural Knowledge) as a form of honor. The other types of academy is an academy of arts (see Academy of Arts) or combination of both (i.e. American Academy of Arts and Sciences).  - Warsaw (; see also other names) is the capital and largest city of Poland. It stands on the Vistula River in east-central Poland, roughly from the Baltic Sea and from the Carpathian Mountains. Its population is estimated at 1.750 million residents within a greater metropolitan area of 3.105 million residents, which makes Warsaw the 9th most-populous capital city in the European Union. The city limits cover , while the metropolitan area covers .    After reading the paragraphs above, we are interested in knowing the entity with which 'unipress' exhibits the relationship of 'instance of'. Find the answer from the choices below.  Choices: - 1  - academy  - academy of sciences  - area  - capital  - case  - city  - combination  - constitution  - final  - history  - metropolitan area  - name  - network  - people  - republic  - research institute  - science  - soviet  - time  - union
Answer:
research institute