Question: What is the name of the presidnetial yacht acquired by the Philippine government in 1959 and has hosted many guests including ballerina Margot Fonteyn?

full_context: Document 1: English National Ballet: English National Ballet is a classical ballet company founded by Dame Alicia Markova and Sir Anton Dolin and based at Markova House in South Kensington, London, England. Along with The Royal Ballet, Birmingham Royal Ballet and Scottish Ballet, it is one of the four major ballet companies in Great Britain. English National Ballet is one of the foremost touring companies in Europe, performing in theatres throughout the UK as well as conducting international tours and performing at special events. The Company employs approximately 67 dancers and a symphony orchestra, (English National Ballet Philharmonic) and there is also an associate school, English National Ballet School, which is independent from the ballet company. The Company regularly performs seasons at the London Coliseum and has been noted for specially staged performances at the Royal Albert Hall. In 2014 English National Ballet became an Associate Company of Sadler's Wells. The Patron of English National Ballet is HRH The Duke of York.
Document 2: Roberto Arias: Roberto Emilio Arias (1918–1989), known as "Tito", was a Panamanian international lawyer, diplomat and journalist who was the husband of ballerina Dame Margot Fonteyn. Arias was from a prominent Panamanian political family, whose members had reached the Presidency four times; amongst them his father Harmodio Arias.
Document 3: Violetta Elvin: Violetta Elvin (born 3 November 1924) is a retired Russian prima ballerina. In 1986, "The Times" described Elvin as “the only rival ever to give Dame Margot Fonteyn a run for her money”.
Document 4: Thayer IV: The Thayer IV was the name of the boat used in the 1981 film "On Golden Pond". There were 3 Thayer IV's used in the movie, including 1 replica used for a crash scene. One was a 1950 Chris-Craft Sportsman (U22-1460), bought by a family in 1982 from marine coordinator Pat Curtin as one of the boats used in the movie. The other boat, also a Chris-Craft Sportsman (U22-1802), was sold in 1983 by the marine coordinator for the movie, Mr. Pat Curtin, as the boat which Henry Fonda and Katharine Hepburn used for their excursions on Golden Pond. At that same time, the buyer of U22-1802 also purchased the replica used in the crash scene. Although the Chris-Craft Sportsman was the main boat used in the movie, the script called for the Thayer IV, a mail boat, a canoe, and a replica of the Thayer IV. These were provided by Patrick Curtin of Eastern Classics, a boatyard in Laconia, New Hampshire, specializing in the restoration of mahogany speed boats. Following World War II, the Sportsman model reappeared as a direct descendant of its 1937 predecessors. The popular model stayed in the Chris Craft line up until 1960. The use of a 1950 Sportsman model as the Thayer IV in "On Golden Pond" did much to generate interest in antique and classic boats.
Document 5: BRP Ang Pangulo (AT-25): BRP "Ang Pangulo" (AT-25) is a presidential yacht and was acquired by the Philippine government in 1959. The yacht was first used by President Carlos P. Garcia for entertaining and over the years the yacht has known many famous guests including British ballerina Margot Fonteyn, actress Brooke Shields, dancer Rudolf Nureyev, concert pianist Van Cliburn and Cristina Ford, former wife of Henry Ford II, who was once chairman of Ford Motor Co.
Document 6: BRP Rajah Humabon (PS-11): The BRP "Rajah Humabon" (PS-11) is a former destroyer escort of the United States Navy and is now a frigate of the Philippine Navy. It is the last World War II-era destroyer escort/frigate active in its fleet and is one of the oldest active warships in the world. She is one of three ex-USN "Cannon"-class destroyer escort s that served the Philippine Navy. The others being BRP "Datu Sikatuna" (PF-5/PS-77) and BRP "Datu Kalantiaw" (PS-76).
Document 7: Alicia Markova: Dame Alicia Markova DBE (1 December 1910 – 2 December 2004) was an English ballerina and a choreographer, director and teacher of classical ballet. Most noted for her career with Sergei Diaghilev's Ballets Russes and touring internationally, she was widely considered to be one of the greatest classical ballet dancers of the twentieth century. She was the first British dancer to become the principal dancer of a ballet company and, with Dame Margot Fonteyn, is one of only two English dancers to be recognised as a prima ballerina assoluta. Markova was a founder dancer of the Rambert Dance Company, The Royal Ballet and American Ballet Theatre, and was co-founder and director of the English National Ballet.
Document 8: The Royal Ballet: The Royal Ballet is an internationally renowned classical ballet company, based at the Royal Opera House in Covent Garden, London, UK. The largest of the four major ballet companies in Great Britain, the Royal Ballet was founded in 1931 by Dame Ninette de Valois, it became the resident ballet company of the Royal Opera House in 1946 and was granted a royal charter in 1956, becoming recognised as Britain's flagship national ballet company.
Document 9: Presidency of Benigno Aquino III: The Presidency of Benigno S. Aquino III, also known as Benigno Aquino III Administration, began at noon on June 30, 2010, when he became the fifteenth President of the Philippines, succeeding Gloria Macapagal-Arroyo. Aquino is the third-youngest person to be elected president, and the fourth-youngest president after Emilio Aguinaldo, Ramon Magsaysay and Ferdinand Marcos. Aquino is the first president to be a bachelor, being unmarried and having no children. Aquino is the second president not to drink alcoholic beverages; the first president not to drink alcohol was Emilio Aguinaldo. Aquino is the eighth president to be a smoker. Aquino is the first graduate of Ateneo de Manila University to become president. Aquino is the third president who will only hold office in Malacañan Palace, but not be a resident, following Corazon Aquino and Fidel V. Ramos. Aquino is the first president to make "Bahay Pangarap" his official residence. Aquino is the third president to use his second given name, "Simeon", as his middle initial, as Manuel L. Quezon and José P. Laurel did. Aquino is the second president to be a child of a former president, his mother was former President Corazon Aquino; the first president to be a child of a former president was President Gloria Macapagal-Arroyo, who is the daughter of former President Diosdado Macapagal.
Document 10: Prima ballerina assoluta: Prima ballerina assoluta is a title awarded to the most notable of female ballet dancers. To be recognised as a "prima ballerina assoluta" is a rare honour, traditionally reserved only for the most exceptional dancers of their generation. Originally inspired by the Italian ballet masters of the early Romantic ballet, and literally meaning "absolute first ballerina", the title was bestowed on a prima ballerina who was considered to be exceptionally talented, above the standard of other leading ballerinas. The title is very rarely used today and recent uses have typically been symbolic, either in recognition of a prestigious international career, or for exceptional service to a particular ballet company. There is no universal procedure for designating who may receive the title, which has led to dispute in the ballet community over who can legitimately claim it. It is usually a ballet company that bestows the title, however some dancers have had the title officially sanctioned by a government or head of state, sometimes for political rather than artistic reasons. Less common is for a dancer to become identified as a "prima ballerina assoluta" as a result of public and critical opinion.
Document 11: Donald Aronow: Donald Joel Aronow (March 3, 1927 – February 3, 1987) was an American designer, builder and racer of the famous Magnum Marine, Cary, Cigarette, Donzi, and Formula speedboats. He built speedboats for the Shah of Iran, Charles Keating, Robert Vesco, Malcolm Forbes, and George H. W. Bush. Retired President Lyndon Johnson owned several 16 ft. Donzi speedboats on his Texas ranch with which he would race his Secret Service agents.
Document 12: USS Ronald Reagan: USS "Ronald Reagan" (CVN-76) is a "Nimitz"-class , nuclear-powered supercarrier in the service of the United States Navy. The ninth ship of her class, she is named in honor of Ronald W. Reagan, president of the United States from 1981 to 1989. Upon her christening in 2001, she was the first ship to be named for a then-still living former president.
Document 13: Fonteyn &amp; Nureyev on Broadway: Fonteyn & Nureyev on Broadway was presented at the George Gershwin Theatre (Uris Theatre), (18 November 1975 - 29 November 1975). The show was a major Broadway and dance event; it was the farewell performance of the legendary ballet duo of Margot Fonteyn and Rudolf Nureyev. The sold-out run included the Frederick Ashton ballet "Marguerite and Armand." Other notable dancers included Lawrence Leritz, Daniel Lommel and The Murray Louis Dance Company.
Document 14: Margot Fonteyn: Dame Margot Fonteyn de Arias, DBE (18 May 191921 February 1991), was an English ballerina. She spent her entire career as a dancer with the Royal Ballet, eventually being appointed "Prima Ballerina Assoluta" of the company by Queen Elizabeth II.
Document 15: Lydia Díaz Cruz: Lydia Diaz Cruz is a Prima Ballerina who started dancing in Havana, Cuba, and trained with Fernando Alonso and Alicia Alonso. As a young dancer, she was talent-spotted by a well-known British dancer and teacher from an earlier era, Dame Phyllis Bedells, who traveled to Cuba and regarded her as the most naturally gifted dancer she'd seen since Margot Fonteyn. Early marriage and exile from Cuba in the wake of the Castro revolution put a halt to her career, which she resumed after the birth of her third child in the early sixties. She went on to dance in the United States with Ballet Concerto in Miami, became principal dancer with the National Ballet of Washington, D.C., and has performed in principal guest roles with the National Ballet of Venezuela, Washington Ballet, Ballet Spectacular. She danced alongside many of the great artists of the day, including Margot Fonteyn and Melissa Hayden, among many others.
ground_truth: BRP "Ang Pangulo"