Detailed Instructions: 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).
Q: Context: Italy, officially the Italian Republic, is a unitary parliamentary republic in Europe. Located in the heart of the Mediterranean Sea, Italy shares open land borders with France, Switzerland, Austria, Slovenia, San Marino and Vatican City. Italy covers an area of and has a largely temperate seasonal climate and Mediterranean climate; due to its shape, it is often referred to in Italy as "lo Stivale" (the Boot). With 61 million inhabitants, it is the fourth most populous EU member state., The Province of Frosinone is a province in the Lazio region of Italy, with 91 "comuni" (singular: "comune"; see Comuni of the Province of Frosinone). Its capital is the city of Frosinone. It has an area of and a total population of 496,420 (2015)., The (plural: "") is a basic administrative division in Italy, roughly equivalent to a township or municipality., Lazio (; ) is one of the 20 administrative regions of Italy, situated in the central peninsular section of the country. With almost 5.9 million residents and a GDP of more than 170 billion euros, Lazio is the second most populated region of Italy (having approximately the same in population as Campania), and has the second largest economy of the nation. Its capital is Rome, capital and largest city of Italy., Pope Gregory IX (born Ugolino di Conti; 1145  22 August 1241), was Pope from 19 March 1227 to his death in 1241. He is known for issuing the "Decretales" and instituting the Papal Inquisition, a mechanism that severely punished people accused of heresy, in response to the failures of the episcopal inquisitions established during the time of Pope Lucius III through his papal bull "Ad abolendam" issued in 1184., Cassino is a "comune" in the province of Frosinone, Italy, at the southern end of the region of Lazio., The Treaty of San Germano was signed on July 20 , 1225 at San Germano , present day Cassino , between Holy Roman Emperor Frederick II and Pope Gregory IX. A Dominican named Guala was responsible for the negotiations . Frederick promised 1000 knights over 2 years , transport for 2000 more knights and he would depart on Crusade in 1227 or lose 100,000 in gold or be excommunicated . He also promised that if he went on Crusade that he would lead . After the treaty was signed , Guala became the bishop of Brescia . Based on the terms of the agreement , Frederick 's forces ceased to occupy portions of the Pontifical States . Moreover , all papal possessions in Sicily were restored to the Pope ., The pope (from "pappas", a child's word for "father") is the Bishop of Rome and, therefore, the leader of the worldwide Catholic Church. The primacy of the Roman bishop is largely derived from his role as the traditional successor to Saint Peter, to whom Jesus is supposed to have given the keys of Heaven and the powers of "binding and loosing", naming him as the "rock" upon which the church would be built. The current pope is Francis, who was elected on 13 March 2013, succeeding Benedict XVI., Subject: treaty of san germano, Relation: country, Options: (A) france (B) italian republic (C) italy (D) lazio (E) san marino (F) vatican city (G) worldwide
A:
vatican city