Please answer the following question: Information:  - A restaurant (or ), or an eatery, is a business which prepares and serves food and drinks to customers in exchange for money. Meals are generally served and eaten on the premises, but many restaurants also offer take-out and food delivery services, and some only offer take-out and delivery. Restaurants vary greatly in appearance and offerings, including a wide variety of cuisines and service models ranging from inexpensive fast food restaurants and cafeterias to mid-priced family restaurants, to high-priced luxury establishments.   - DIXIE is an obsolete protocol for accessing X.500 directory services. DIXIE was intended to provide a lightweight means for clients to access X.500 directory services. DIXIE allowed TCP/IP clients to connect a DIXIE-to-DAP gateway which would provide access to the X.500 Directory Service. This design allows the client to access the directory without requiring it to support the cumbersome Open Systems Interconnection protocol stack.  - In geography, regions are areas that are broadly divided by physical characteristics (physical geography), human impact characteristics (human geography), and the interaction of humanity and the environment (environmental geography). Geographic regions and sub-regions are mostly described by their imprecisely defined, and sometimes transitory boundaries, except in human geography, where jurisdiction areas such as national borders are defined in law.  - The United States Census Bureau (USCB; officially the Bureau of the Census, as defined in Title ) is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy.  - The Southern United States, commonly referred to as the American South, Dixie, or simply the South, is a region of the United States of America. The South does not exactly match the geographic south, but is predominantly located in the southeastern corner; Arizona and New Mexico, which are geographically in the southern part of the country, are rarely considered part of the Southern United States, while West Virginia, which separated from Virginia in 1863, commonly is. Some scholars have proposed definitions of the South that do not coincide neatly with state boundaries. While the states of Delaware and Maryland, as well as the District of Columbia permitted slavery prior to the start of the Civil War, they remained with the Union. Since the Civil Rights Movement of the 1960s, they became more culturally, economically, and politically aligned with the industrial Northern states, and are often identified as part of the Mid-Atlantic and/or Northeast by many residents, businesses, public institutions, and private organizations. However, the United States Census Bureau puts them in the South.  - Delaware is a state located in the Mid-Atlantic and/or Northeastern regions of the United States. It is bordered to the south and west by Maryland, to the northeast by New Jersey, and to the north by Pennsylvania. The state takes its name from Thomas West, 3rd Baron De La Warr, an English nobleman and Virginia's first colonial governor.  - Virginia (, officially the Commonwealth of Virginia) is a state located in the Mid-Atlantic region of the United States, as well as in the historic Southeast. Virginia is nicknamed the "Old Dominion" due to its status as the first colonial possession established in mainland British America, and "Mother of Presidents" because eight U.S. presidents were born there, more than any other state. The geography and climate of the Commonwealth are shaped by the Blue Ridge Mountains and the Chesapeake Bay, which provide habitat for much of its flora and fauna. The capital of the Commonwealth is Richmond; Virginia Beach is the most populous city, and Fairfax County is the most populous political subdivision. The Commonwealth's estimated population is over 8.3 million, which is slightly less than New York City.  - Chicken Express is a regional chain of fast food restaurants concentrated in the Southern United States .  - New Mexico is a state located in the southwestern region of the United States of America. It was admitted to the union as the 47th state on January 6, 1912. It is usually considered one of the Mountain States. New Mexico is fifth by area, the 36th-most populous, and the sixth-least densely populated of the 50 United States.  - A fast food restaurant, also known as a quick service restaurant (QSR) within the industry, is a specific type of restaurant characterized both by its fast food cuisine and by minimal table service. Food served in fast food restaurants typically caters to a "meat-sweet diet" and is offered from a limited menu; is cooked in bulk in advance and kept hot; is finished and packaged to order; and is usually available ready to take away, though seating may be provided. Fast food restaurants are typically part of a restaurant chain or franchise operation, which provisions standardized ingredients and/or partially prepared foods and supplies to each restaurant through controlled supply channels. The term "fast food" was recognized in a dictionary by MerriamWebster in 1951.  - Fast food is a type of mass-produced food that is prepared and served very quickly. It began with the first fish and chip shops in Britain in the 1860s. Drive-through restaurants were first popularized in the 1950s in the United States. The food is typically less nutritionally valuable compared to other foods and dishes. While any meal with low preparation time can be considered fast food, typically the term refers to food sold in a restaurant or store with preheated or precooked ingredients, and served to the customer in a packaged form for take-out/take-away. Fast food restaurants are traditionally distinguished by their ability to serve food via a drive-through. The term "fast food" was recognized in a dictionary by MerriamWebster in 1951.  - West Virginia is a state located in the Appalachian region of the Southern United States. It is bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the north (and, slightly, east), and Maryland to the northeast. West Virginia is the 41st largest by area, the 38th most populous, and has the second lowest household income of the 50 United States. The capital and largest city is Charleston.  - Arizona (O'odham: "Al onak" [ai onak]) is a state in the southwestern region of the United States. It is also part of the Western United States and the Mountain West states. It is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, and one point in common with the southwestern corner of Colorado. Arizona's border with Mexico is 389 miles (626 km) long, on the northern border of the Mexican states of Sonora and Baja California.  - Maryland is a state located in the Mid-Atlantic region of the United States, bordering Virginia, West Virginia, and Washington, D.C. to its south and west; Pennsylvania to its north; and Delaware to its east. The state's largest city is Baltimore, and its capital is Annapolis. Among its occasional nicknames are "Old Line State", the "Free State", and the "Chesapeake Bay State". The state is named after Henrietta Maria of France, the wife of Charles I of England.     After reading the paragraphs above, we are interested in knowing the entity with which 'chicken express' exhibits the relationship of 'instance of'. Find the answer from the choices below.  Choices: - agency  - bay  - border  - census  - city  - client  - climate  - country  - county  - data  - delivery  - dictionary  - district  - dominion  - eight  - england  - environment  - family  - fast food  - fish  - food  - geography  - human  - income  - jurisdiction  - line  - mass  - meal  - name  - part  - point  - protocol  - protocol stack  - region  - restaurant  - restaurant chain  - ridge  - service  - slavery  - state  - status  - store  - subdivision  - term  - union  - variety  - virginia  - wife
Answer:
restaurant chain