Please answer the following question: Information: - An executive director is a chief executive officer (CEO) or managing director of an organization, company, or corporation. The title is widely used in North American non-profit organizations, though many United States nonprofits have adopted the title president or CEO. - Nuremberg is a city on the river Pegnitz and the RhineMainDanube Canal in the German state of Bavaria, in the administrative region of Middle Franconia, about north of Munich. It is the second-largest city in Bavaria (after Munich), and the largest in Franconia (Franken). The population as of February 2015, is 517,498, which makes it Germany's fourteenth-largest city. The urban area also includes Furth, Erlangen and Schwabach with a total population of . The "European Metropolitan Area Nuremberg" has ca. 3.5 million inhabitants. - Heinrich von Pierer ( exactly Heinrich Karl Friedrich Eduard Pierer von Esch ) ( born 26 January 1941 in Erlangen ) is a German manager . From 1992 to 2005 , he was CEO of Siemens AG. Subsequently , he was chairman of the supervisory board from which he resigned on 25 April 2007 . - Bavaria is a federal state of Germany. Located in the German southeast with an area of 70,548 square kilometres (27,200 sq mi), Bavaria is the largest German state. Its territory comprises roughly a fifth of the total land area of Germany, and, with 12.9 million inhabitants, it is Germany's second most populous state. Munich, Bavaria's capital and largest city, is the third largest city in Germany. - A supervisory board or supervisory committee, often called "board of directors", is a group of individuals chosen by the stockholders of a company to promote their interests through the governance of the company and to hire and supervise the executive directors and CEO. - Erlangen (East Franconian: "Erlang") is a Middle Franconian city in Bavaria, Germany. It is located north-west of Nuremberg at the confluence of the river Regnitz and its large tributary, the "Schwabach". Erlangen has more than 100,000 inhabitants. - A board of directors is a body of elected or appointed members who jointly oversee the activities of a company or organization, which can include a non-profit organization or a government agency or corporation. A board of directors' activities are determined by the powers, duties, and responsibilities delegated to it or conferred on it by an authority outside itself. These matters are typically detailed in the organization's constitution and bylaws. These documents commonly also specify the number of members of the board, how they are to be chosen, and how often they are to meet. However, the constitution and bylaws rarely address a board's powers when faced with a corporate turnaround, restructuring, or emergencies, where board members need to act as agents of change in addition to their traditional fiduciary responsibilities. Given the information above, choose from the list below the object entity that exhibits the relation 'position held' with the subject 'heinrich von pierer'. Choices: - 12 - 3 - board of directors - ceo - chief executive officer - executive director
A:
chief executive officer