Please answer the following question: Information: - San Luis Obispo County, officially the County of San Luis Obispo, is a county located in the U.S. state of California. As of the 2010 census, the population was 269,637. The county seat is San Luis Obispo. - A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is used in the United States, Canada, Romania, China and Taiwan. In the United Kingdom and Ireland, county towns have a similar function. - A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of pressure if rising volatile-charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption. Glacial erosion can lead to exposure of the plug on one side, while a long slope of material remains on the opposite side. Such landforms are called crag and tail. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive upstanding landform. - Cerro Romauldo is a 1,300 - foot ( 396 m ) hill in San Luis Obispo County , California . The hill is the fifth in a series of volcanic plugs called the Nine Sisters . Until 1964 the hill was officially known as Romualdo Peak . The hill is named for a Chumash man who received the 117 - acre ( 0.47 km2 ) Rancho Huerta de Romualdo Mexican land grant from Pio Pico , the last Mexican Governor of Alta California . Huerta de Romauldo means Romauldo 's kitchen garden or orchard in Spanish . He sold the land to Captain John Wilson in 1846 . In the 1890s , rock from Cerro Romauldo was used in the construction of the Southern Pacific Railroad . Cerro Romauldo is owned by the State of California , and is used by the California National Guard at adjacent Camp San Luis Obispo for fitness training . - 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. - The Nine Sisters or the Morros are a chain of nine volcanic mountains and hills in western San Luis Obispo County, central California. They run from Morro Bay east through San Luis Obispo. - A crag (sometimes spelled cragg, or in Scotland craig) is a rocky hill or mountain, generally isolated from other high ground. Crags are formed when a glacier or ice sheet passes over an area that contains a particularly resistant rock formation (often a granite, volcanic plug or some other volcanic structure). The force of the glacier erodes the surrounding softer material, leaving the rocky block protruding from the surrounding terrain. Frequently the crag serves as a partial shelter to softer material in the wake of the glacier, which remains as a gradual fan or ridge forming a tapered ramp (called the tail) up the leeward side of the crag. - A U.S. state is a constituent political entity of the United States of America. There are 50 states, which are bound together in a union with each other. Each state holds administrative jurisdiction over a defined geographic territory, and shares its sovereignty with the United States federal government. Due to the shared sovereignty between each state and the federal government, Americans are citizens of both the federal republic and of the state in which they reside. State citizenship and residency are flexible, and no government approval is required to move between states, except for persons covered by certain types of court orders (e.g., paroled convicts and children of divorced spouses who are sharing custody). - California is the most populous state in the United States and the third most extensive by area. Located on the western (Pacific Ocean) coast of the U.S., California is bordered by the other U.S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. The state capital is Sacramento. Los Angeles is California's most populous city, and the country's second largest after New York City. The state also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County. After reading the paragraphs above, choose the best answer for the entity that related to 'cerro romauldo' with the relationship of 'instance of'. Choices: - agriculture - area - bay - census - chain - city - country - county - county seat - court - federal government - federal republic - government - information - jurisdiction - mountain - nine - ocean - population - practice - procedure - seat of government - sharing - state - territory - union
A:
mountain