Please answer the following question: Information:  - Elementary school is a school for students at their first school years, before they enter secondary education. The exact ages vary by country. Elementary school is usually part of the compulsory education, especially in the Western countries. Examples. (Scotland) leave nursery age 4 and start primary school for the next 7 years which would be primary 1 (age 4 to 5) and so on until primary 7 which would be the last year at primary school at age (9 to 10) then after that off to high school at age 11 to 12  - A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common censuses include agriculture, business, and traffic censuses. The United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory, simultaneity and defined periodicity", and recommends that population censuses be taken at least every 10 years. United Nations recommendations also cover census topics to be collected, official definitions, classifications and other useful information to co-ordinate international practice.  - A school is an institution designed to provide learning spaces and learning environments for the teaching of students (or "pupils") under the direction of teachers. Most countries have systems of formal education, which is commonly compulsory. In these systems, students progress through a series of schools. The names for these schools vary by country (discussed in the "Regional" section below) but generally include primary school for young children and secondary school for teenagers who have completed primary education. An institution where higher education is taught, is commonly called a university college or university.  - Chicago O'Hare International Airport , also known as O'Hare Airport, Chicago International Airport, Chicago O'Hare or simply O'Hare, is an international airport on the Far Northwest Side of Chicago, Illinois, northwest of the Loop. It is the primary airport serving the Chicago metropolitan area, with Midway International Airport, about closer to the Loop, serving as a secondary airport. It is operated by the City of Chicago Department of Aviation.  - Chicago (or ), officially the City of Chicago, is the third-most populous city in the United States, and the fifth-most populous city in North America. With over 2.7 million residents, it is the most populous city in the state of Illinois and the Midwestern United States, and the county seat of Cook County. The Chicago metropolitan area, often referred to as Chicagoland, has nearly 10 million people and is the third-largest in the U.S.  - Secondary education normally takes place in secondary schools, taking place after primary education and may be followed by higher education or vocational training. In some countries, only primary or basic education is compulsory, but secondary education is included in compulsory education in most countries. In post-Soviet countries it is also known as general education or general middle education.  - Compulsory education refers to a period of education that is required of all people and is imposed by law. Depending on the country, this education may take place at a registered school (schooling) or at home (homeschooling).  - Illinois is a state in the midwestern region of the United States, achieving statehood in 1818. It is the 5th most populous state and 25th largest state in terms of land area, and is often noted as a microcosm of the entire country. The word "Illinois" comes from the Algonquin word for "tribe of superior men". With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal, timber, and petroleum in the south, Illinois has a diverse economic base and is a major transportation hub. The Port of Chicago connects the state to other global ports from the Great Lakes, via the Saint Lawrence Seaway, to the Atlantic Ocean, as well as the Great Lakes to the Mississippi River, via the Illinois River. For decades, O'Hare International Airport has been ranked as one of the world's busiest airports. Illinois has long had a reputation as a bellwether both in social and cultural terms and politics.  - A student or pupil is a learner, or someone who attends an educational institution. In Britain those attending university are termed "students". In the United States, and more recently also in Britain, the term "student" is applied to both categories. In its widest use, "student" is used for anyone who is learning, including mid-career adults who are taking vocational education or returning to university. When speaking about learning outside an institution, "student" is also used to refer to someone who is learning a topic or who is "a student of" a certain topic or person.  - Park Ridge is a city in Cook County, Illinois, United States, and a Chicago suburb. The population was 37,480 at the 2010 census. It is located northwest of downtown Chicago. It is close to O'Hare International Airport, major expressways, and rail transportation. It is a part of the Chicago metropolitan area, bordering two northwestern neighborhoods of Chicago's Far North Side (Edison Park and Norwood Park).  - Eugene Field Elementary School is an elementary school in Park Ridge , Illinois , USA . The most notable student who attended the school is Hillary Rodham Clinton , who went there in the 1950s and later to Ralph Waldo Emerson Middle School . Hillary Clinton gave a speech on February 15 , 2006 mentioning Eugene Field Elementary School . In 1997 Clinton , when she was the First Lady , visited this school at reunion with her friends and teachers .  - The Chicago metropolitan area, or Chicagoland, is the metropolitan area associated with the city of Chicago, Illinois, and its suburbs. With an estimated population of 9.4 million people, it is the third largest metropolitan area in the United States. Chicagoland is the area that is closely linked to the city through geographic, social, economic, and cultural ties.    Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'eugene field elementary school'.  Choices: - 1  - 12  - age  - agriculture  - airport  - area  - aviation  - census  - city  - college  - country  - county  - department  - direction  - education  - educational institution  - information  - loop  - may  - metropolitan  - metropolitan area  - ocean  - official  - park  - part  - period  - primary school  - procedure  - ridge  - saint  - school  - secondary education  - secondary school  - state  - student  - territory  - tribe  - two  - university  - year
Answer:
primary school