Question: What is the official currency in the country where Ramon Sandin is a citizen?

full_context: Document 1: Rim Ju-song: At the time when he was selected, he was living in Beijing. By the time North Korea received clearance to compete in London, it was "too late to qualify for most events, but swimming was an exception". Thus North Korea's representative would have to be a swimmer. Rim, who did not know how to swim, began to learn the crawl stroke in April 2012, reportedly with great difficulty at first, and the breaststroke in May.
Document 2: Ramon Sandin: Ramon Sandin, also known as Guy Sandin, (born 9 January 1970) is a native of Puerto Rico who competed in the diving competitions at the 1996 Summer Olympics held in the United States at Atlanta, Georgia, representing his native island.
Document 3: Roberto Moya: He was born in Havana, Ciudad de la Habana. He won the bronze medal at the 1992 Summer Olympics in this event, and his personal best is 65.68.
Document 4: Puerto Sandino: Puerto Sandino is a coastal town in western Nicaragua. Prior to the 1979 revolution it was known as Puerto Somoza. Due to its crude oil supply line, it is a major port, and also plays a large role in Nicaragua's fishing industry. Puerto Sandino is an extremely popular location for surfing.
Document 5: Ramón Power y Giralt: Captain Ramón Power y Giralt (October 7, 1775 – June 10, 1813), commonly known as Ramón Power, was, according to Puerto Rican historian Lidio Cruz Monclova, among the first native-born Puerto Ricans to refer to himself as a "Puerto Rican" and to fight for the equal representation of Puerto Rico in front of the parliamentary government of Spain.
Document 6: Jordi Sans: Jordi "Chiqui" Sans Juan (born August 3, 1965 in Barcelona, Catalonia) is a former water polo player from Spain, who was a member of the national team that won the gold medal at the 1996 Summer Olympics in Atlanta, United States. Four years earlier, when his home town of Barcelona hosted the Games, he was on the side that captured the silver medal.
Document 7: Manuel Guzmán: Manuel Guzmán Flores (born October 13, 1969) is a former international backstroke and freestyle swimmer from Puerto Rico, who participated in two consecutive Summer Olympics for his native country, starting in 1988. His best result was a 12th place in the Men's 4 × 100 m Freestyle Relay at the 1992 Summer Olympics in Barcelona, Spain. He graduated from Bloomington High School South in 1989 where he was an individual state champion and helped lead the team to a state runner-up finish.
Document 8: Republic of Cuba (1902–1959): After the Spanish -- American War, Spain and the United States signed the Treaty of Paris (1898), by which Spain ceded Puerto Rico, the Philippines, and Guam to the United States for the sum of $20 million. Cuba gained formal independence from the U.S. on May 20, 1902, as the Republic of Cuba. Under Cuba's new constitution, the U.S. retained the right to intervene in Cuban affairs and to supervise its finances and foreign relations. Under the Platt Amendment, the U.S. leased the Guantánamo Bay naval base from Cuba.
Document 9: History of Puerto Rico: After the ratification of the Treaty of Paris of 1898, Puerto Rico came under the military control of the United States of America. This brought about significant changes: the name of the island was changed to Porto Rico (it was changed back to Puerto Rico in 1932) and the currency was changed from the Puerto Rican peso to the United States dollar. Freedom of assembly, speech, press, and religion were decreed and an eight-hour day for government employees was established. A public school system was begun and the U.S. Postal service was extended to the island. The highway system was enlarged, and bridges over the more important rivers were constructed. The government lottery was abolished, cockfighting was forbidden, and a centralized public health service established. Health conditions were poor at the time, with high rates of infant mortality and numerous endemic diseases.
Document 10: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for Spain during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government influenced the island's cultural landscapes with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish Empire, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris.
Document 11: History of Puerto Rico: In 1898, during the Spanish -- American War, Puerto Rico was invaded and subsequently became a possession of the United States. The first years of the 20th century were marked by the struggle to obtain greater democratic rights from the United States. The Foraker Act of 1900, which established a civil government, and the Jones Act of 1917, which made Puerto Ricans U.S. citizens, paved the way for the drafting of Puerto Rico's Constitution and its approval by Congress and Puerto Rican voters in 1952. However, the political status of Puerto Rico, a Commonwealth controlled by the United States, remains an anomaly.
Document 12: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for the Crown of Castile during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government transformed the island's ethnic, cultural and physical landscapes primarily with waves of African slaves, and Canarian, and Andalusian settlers. In the Spanish imperial imagination, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico along with other Spanish colonies under the terms of the Treaty of Paris.
Document 13: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for Spain during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government influenced the island's cultural landscapes with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish Empire, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris. The treaty took effect on April 11, 1899.
Document 14: Raymond Gause: In 1992, he played in the first international event NBA players were allowed to compete in at the 1992 Tournament of the Americas in Portland, Oregon and helped Puerto Rico qualify for the 1992 Summer Olympics in Barcelona, Spain. The 1992 Olympics marked his last participation in International Competition.
Document 15: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for the Crown of Castile during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government transformed the island's ethnic, cultural and physical landscapes primarily with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish imperial imagination, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris.
ground_truth: United States dollar
sub_queries: Ramon Sandin >> country of citizenship Answer: Puerto Rico
What is the current official currency in Puerto Rico ? Answer: United States dollar