Question: In which competition held in Buenos Aires, Argentina did Stanly Stanczyk win a gold medal?

Context paragraphs:
1950 FIBA World Championship: The 1950 FIBA World Championship (also called the 1st World Basketball Championship – 1950) was an international basketball tournament held by the International Basketball Federation in Buenos Aires, Argentina, from October 22 to November 3, 1950.  Ten nations participated in the inaugural tournament.  All competition was held at the Luna Park, Buenos Aires.  Argentina claimed the gold medal, by beating the United States 64–50.

ATP Buenos Aires: The ATP Buenos Aires (Spanish "Abierto de Buenos Aires") is an annual tennis event for male tennis players held in Buenos Aires, Argentina.  The tournament is an ATP World Tour 250 series event on the 2014 ATP World Tour, and is played on outdoor clay courts at the 5,500 capacity Buenos Aires Lawn Tennis Club, in the Palermo "barrio" (neighbourhood).  Usually held in February, it includes both a men's singles and a men's doubles tournament.  Between 1970 and 1989 it was part of the Grand Prix tennis circuit and a Grand Prix Super Series event (1970–71).

Edward Banfield (railroad engineer): Edward Banfield (9 February 1837 – 6 July 1872) was an English railroad engineer who drove the first locomotive ("La Porteña") through Buenos Aires, Argentina, in 1857 as part of the Buenos Aires Western Railway.  He was the first General Manager of the British-owned Buenos Aires Great Southern Railway between 1865 and 1872, founded in Argentina by Edward Lund in 1862.  Banfield died in 1872, and the town of Banfield in Buenos Aires Province, founded in 1873, was named after him.  The professional Argentine football club Club Atlético Banfield also carries his name.

1951 Pan American Games: The 1951 Pan American Games (the I Pan American Games) were held in Buenos Aires, Argentina between 25 February-9 March 1951.  The Pan American Games' origins were at the Games of the X Olympiad in Los Angeles, United States, where officials representing the National Olympic Committees of the Americas discussed the staging of an Olympic-style regional athletic competition for the athletes of the Americas.

Odilia Suárez: Odilia Suárez (12 November 1923-11 August 2006) was an Argentine architect, educator and urban planner.  After graduating with the Gold Medal for 1950 from the University of Buenos Aires, she studied at Taliesin West with Frank Lloyd Wright and studied municipal planning in Canada, Great Britain and the United States.  After returning to Argentina in 1964, she opened her own design studio at the University of Buenos Aires, working her way through the academic ranks to head the post-graduate research program in the architectural department, to finally Professor Emerita of the School of Architecture and Urbanism.  At a time when few women were able to work in the field, Suárez was a pioneer and was committed to region-wide professionalism and scholarship.  As an urban planner, she served as president of the City Council of Urban Planning for Buenos Aires and consulted on projects in Managua, Nicaragua and Puerto Madero.  Her expertise led to a consultancy with the United Nations for planning and urban design throughout Latin America.  Throughout her career, she won nineteen national architecture prizes and was one of the pillars of urban planning for Buenos Aires.

Stanley Stanczyk: Stanley Anthony "Stan" Stanczyk (May 10, 1925 – July 3, 1997) was an American weightlifter.  Between 1946 and 1952 he won five consecutive world titles in three different weight classes, six consecutive national titles, as well as gold medals at the 1948 Summer Olympics and 1951 Pan American Games.  In 1946–1949 he set seven ratified world records: four in the snatch, one in the clean and jerk and two in the total.  Stanczyk finished second at the 1952 Summer Olympics and third at the 1953 and 1954 world championships.

Magda Frank: Magda Frank Fischer (July 20, 1914 – June 23, 2010) was a Hungarian-Argentine sculptor.  She was born in Kolozsvár, Transylvania, which at that time belonged to Hungary but in 1918, was incorporated into Romania.  Because of Nazi persecution, she left Hungary to settle in Switzerland.  Years later, she moved to Paris to study at the Académie Julian.  In 1950, she arrived in Buenos Aires, Argentina to visit her brother, her only living family member.  Here, she was appointed professor at the Artes Visuales de Buenos Aires and exhibited at the Galería Pizarro.  She participated in the Premio Palanza Buenos Aires.  She received the Benito Quinquela Martín award at the Eduardo Sívori Museum, and was honored by the Argentine Senate.  Her works are part of the collections at the Musée National d'Art Moderne in Paris, the National Museum of Fine Arts in Paris, the National Museum of Fine Arts in Buenos Aires.  Frank resettled in Argentina in 1995 and built the Magda Frank House Museum in the Saavedra barrio at Vedia 3546.  She died in 2010 in Buenos Aires, Argentina.

Ingeborg Mello: Ingeborg Mello de Preiss (Germany, January 4, 1919 – Buenos Aires, Argentina, October 25, 2009) was a track and field athlete from Argentina who competed mainly in the discus throw and the shot put.  She represented Argentina at the 1948 and 1952 Summer Olympic Games.  She won the gold medal in the women's discus throw and the shot put event at the 1951 Pan American Games in Buenos Aires, Argentina.

National University of Central Buenos Aires: The National University of Central Buenos Aires ("Universidad Nacional del Centro de Buenos Aires") is a public institution of higher learning located in Tandil, a city in the central region of Buenos Aires Province, Argentina.  It was founded in 1974 as part of University of Buenos Aires Professor Alberto Taquini's plan to geographically diversify Argentina's National University system.

Raúl Sanguineti: Raúl Carlos Sanguineti (Paraná, 2 February 1933 – Buenos Aires, 6 August 2000) was an Argentine chess Grandmaster.  He won the Argentine Chess Championship seven times, in 1956, 1957, 1962, 1965, 1968, 1973 and 1974.  Raúl Sanguineti played for Argentina in seven Chess Olympiads.  He won two individual gold medals at Moscow 1956 and Varna 1962, and two team bronze medals at Munich 1958 and Varna 1962.  In total, he represented his country in seven Olympiads with an aggregate of over 70 per cent (46 -7 =42).  He played in the World Chess Championship Interzonals at Portorož 1958 and Biel 1976.  Important tournament victories included São Paulo 1957, Bariloche 1960, Buenos Aires (Club Argentino) 1963, Punte del Este 1964, Buenos Aires Open 1968, Fortaleza Zonal 1975, Mar del Plata 1976, Buenos Aires 1977, and Santos Lugares 1977.  During his competitive career, which ran from 1954 to 1977, he very rarely finished in the bottom half of the tournament table.  In 1980 he won the Konex Award as one of the 5 best chess players of the decade in his country.

Supporting paragraphs: Stanley Stanczyk 1951 Pan American Games
Answer: The 1951 Pan American Games