Answer the following question: Information: - In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon, and thus are group 14 hydrides. Hydrocarbons from which one hydrogen atom has been removed are functional groups, called hydrocarbyls. Aromatic hydrocarbons (arenes), alkanes, alkenes, cycloalkanes and alkyne-based compounds are different types of hydrocarbons. - Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772. Although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. The name "nitrogen" was suggested by Jean-Antoine-Claude Chaptal in 1790, when it was found that nitrogen was present in nitric acid and nitrates; this name derives from the Greek roots "nitre" and - "to form". Antoine Lavoisier suggested instead the name "azote", from the Greek "no life", as it is an asphyxiant gas; his name is instead used in many languages, such as French, Russian, and Turkish, and appears in the English names of some nitrogen compounds such as hydrazine, azides and azo compounds. - Carbon dioxide (chemical formula CO) is a colorless and odorless gas that is vital to life on Earth. This naturally occurring chemical compound is made up of a carbon atom covalently double bonded to two oxygen atoms. Carbon dioxide exists in Earth's atmosphere as a trace gas at a concentration of about 0.04 percent (400 ppm) by volume. Natural sources include volcanoes, hot springs and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, in ice caps and glaciers and also in seawater. It is present in deposits of petroleum and natural gas. - Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements. - SandRidge Energy ( NYSE : SD ) is an oil and natural gas exploration company headquartered in Oklahoma City , United States . SandRidge was founded in 2006 by Tom Ward by virtue of buying approximately 50 % of Riata Energy of Amarillo , TX . SandRidge 's drilling activities are focused on its oil properties in the Mid-Continent and Permian Basin . The Company also maintains production in West Texas . The company owns and operates drilling rigs under the brand name Lariat Services , Inc. The company made its initial public offering on November 5 , 2007 , offering over 28 million common stocks at roughly $ 26.00 US a share . SandRidge is traded on the New York Stock Exchange under the symbol SD . However , the stock price began to drop when natural gas prices decreased in 2008 . As of April 7 , 2015 , SandRidge Energy had just under 484 million common shares outstanding at approximately US $ 2.00 per share . Tom L. Ward created the company in June 2006 with the Riata asset purchase , becoming the CEO and chairman . Ward previously co-founded Chesapeake Energy and was the chief operating officer of that company from 1989 until 1996 . On June 19 , 2013 , Tom L. Ward , who founded the company in 2006 and has served as chief executive officer and chairman of the company since it was founded , left the company , leaving James Bennett as CEO who retains his title as president . Former lead independent director Jeffrey Serota serves as interim non-executive chairman effective the same date . Bennett has served as chief financial officer of SandRidge since January 2011 and was promoted to president in March 2013 . Prior to joining SandRidge he was managing director for White Deer Energy , a private equity fund focused on the oil and gas industry . From 2006 to December 2009 , Bennett was employed by GSO Capital Partners , where he served in various capacities in its energy group , including as a managing director . His prior experience also includes serving as chief financial officer of Aquilex Services Corp. , a First... - Methane (or ) is a chemical compound with the chemical formula (one atom of carbon and four atoms of hydrogen). It is a group 14 hydride and the simplest alkane, and is the main constituent of natural gas. The relative abundance of methane on Earth makes it an attractive fuel, though capturing and storing it poses challenges due to its gaseous state under normal conditions for temperature and pressure. - Hydrogen sulfide is the chemical compound with the formula . It is a colorless gas with the characteristic foul odor of rotten eggs. It is very poisonous, corrosive, and flammable. - A combined statistical area (CSA) is composed of adjacent metropolitan (MSA) and micropolitan statistical areas (SA) in the United States and Puerto Rico that can demonstrate economic or social linkage. The United States Office of Management and Budget defines a CSA as consisting of various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. These areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area. - Oklahoma City is the capital and largest city of the state of Oklahoma. The county seat of Oklahoma County, the city ranks 27th among United States cities in population. The population grew following the 2010 Census, with the population estimated to have increased to 631,346 as of July 2015. As of 2015, the Oklahoma City metropolitan area had a population of 1,358,452, and the Oklahoma City-Shawnee Combined Statistical Area had a population of 1,459,758 (Chamber of Commerce) residents, making it Oklahoma's largest metropolitan area. - Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture would contain a variety of pure gases much like the air. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image. One type of commonly known gas is steam. - Ethane (or ) is an organic chemical compound with chemical formula CH. At standard temperature and pressure, ethane is a colorless, odorless gas. Like many hydrocarbons, ethane is isolated on an industrial scale from natural gas and as a petrochemical byproduct of petroleum refining. Its chief use is as feedstock for ethylene production. - Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium. It is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the surface of the Earth over millions of years. The energy that the plants originally obtained from the sun is stored in the form of chemical bonds in the gas. Given the information above, choose from the list below the object entity that exhibits the relation 'industry' with the subject 'sandridge energy'. Choices: - chemistry - commerce - gas - human - management - natural gas - petroleum
Answer:
petroleum