You will be given a definition of a task first, then some input of the task.
In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: Adolfo López Mateos (26 May 1909  22 September 1969) was a Mexican politician affiliated with the Institutional Revolutionary Party (PRI) who served as President of Mexico from 1958 to 1964., The League of Nations (abbreviated as LN in English, "La Société des Nations" abbreviated as SDN or SdN in French) was an intergovernmental organisation founded on 10 January 1920 as a result of the Paris Peace Conference that ended the First World War. It was the first international organisation whose principal mission was to maintain world peace. Its primary goals, as stated in its Covenant, included preventing wars through collective security and disarmament and settling international disputes through negotiation and arbitration. Other issues in this and related treaties included labour conditions, just treatment of native inhabitants, human and drug trafficking, the arms trade, global health, prisoners of war, and protection of minorities in Europe. At its greatest extent from 28 September 1934 to 23 February 1935, it had 58 members., Collective security can be understood as a security arrangement, political, regional, or global, in which each state in the system accepts that the security of one is the concern of all, and therefore commits to a collective response to threats to, and breaches to peace. Collective security is more ambitious than systems of alliance security or collective defense in that it seeks to encompass the totality of states within a region or indeed globally, and to address a wide range of possible threats. While collective security is an idea with a long history, its implementation in practice has proved problematic. Several prerequisites have to be met for it to have a chance of working., Manuel Tello Baurraud ( 1 November 1898 -- 27 November 1971 ) was a Mexican diplomat who represented his country at the League of Nations ( 1938 -- 41 ) and served twice as Secretary of Foreign Affairs ; first in the cabinet of President Miguel Alemán Valdés ( 1951 -- 52 ) and years later in the cabinet of Adolfo López Mateos ( 1958 -- 64 ) . In the interim , he served as ambassador of Mexico to the United States ( 1952 -- 58 ) ., The Institutional Revolutionary Party (PRI) is a Mexican political party founded in 1929, that held power uninterruptedly in the country for 71 years from 1929 to 2000, first as the National Revolutionary Party, then as the Party of the Mexican Revolution., Mexico (, modern Nahuatl ), officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Covering almost two million square kilometers (over 760,000 sq mi), Mexico is the sixth largest country in the Americas by total area and the 13th largest independent nation in the world. With an estimated population of over 120 million, it is the eleventh most populous country and the most populous Spanish-speaking country in the world while being the second most populous country in Latin America. Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana and León., Miguel Alemán Valdés (September 29, 1900  May 14, 1983) served as the President of Mexico from 1946 to 1952. His administration was characterized by Mexico's rapid industrialization, but also for a high level of personal enrichment for himself and his associates., Subject: manuel tello baurraud, Relation: member_of_political_party, Options: (A) alliance (B) institutional revolutionary party (C) republic
Output:
institutional revolutionary party