Question: In which province was the sponsor of Quilmes Rock founded in?

Context paragraphs:
Cerveza Quilmes: Cervecería y Maltería Quilmes (] ) is an Argentine Brewery founded in 1888 in Quilmes, Buenos Aires Province, by Otto Bemberg, a German immigrant.

Ruins of Quilmes: The Ruins of Quilmes is an archaeological site in the Calchaquí Valleys, Tucumán Province, Argentina.  The site was the largest pre-Columbian settlement in the country, occupying about 30 hectares.  The area dates back to ca 850 AD and was inhabited by the Quilmes people; it is believed that about 5,000 people lived here during its heights.

Quilmes Rock: Quilmes Rock is a major Argentine music festival, held annually from 2002 to 2004, and from 2007 on.  It is named after its main sponsor, Cerveza Quilmes brewery.  It was held in several venues in Buenos Aires, including the Ferro Stadium and River Plate Stadium.

Bernal, Argentina: Bernal is a city located in the northeast of Quilmes in the province of Buenos Aires, approximately 10 miles south of the city of Buenos Aires.  It is the second largest and most populated city in the Partido of Quilmes.  Bernal borders Avellaneda Partido and Lanús Partido to the north-west, the city of Quilmes to the south-east, Almirante Brown Partido and Lomas de Zamora Partido to the south-west the Río de la Plata to the north-east.

Quilmes de Mar del Plata: Club Atlético Quilmes (mostly known as Quilmes de Mar del Plata) is a sports club based in Mar del Plata, Buenos Aires Province, Argentina.  Although other sports are practised in the club, Quilmes is mostly known for its basketball team, which currently plays in the Liga Nacional de Básquet, the top division of Argentine league system.

Roman Catholic Diocese of Quilmes: The Roman Catholic Diocese of Quilmes is located in the city of Quilmes, capital of Quilmes Partido, in the province of Buenos Aires in Argentina.  It was established by Pope Paul VI on 19 June 1976.

Quilmes Atlético Club: Quilmes Atlético Club (] ) is an Argentine sports club based in the Quilmes district of Greater Buenos Aires.  Quilmes is one of the oldest clubs of Argentina still competing in official tournaments, having been founded in 1887.  Its football squad currently plays in the Primera División, the top division of the Argentine football league system.

Quilmes people: The Quilmes people were an indigenous tribe of the Diaguita group settled in the western subandean valleys of today’s Tucumán province, in northwestern Argentina.  They fiercely resisted the Inca invasions of the 15th century, and continued to resist the Spaniards for 130 years, until being defeated in 1667.  Spanish invaders relocated the last 2,000 survivors to a reservation ("reducción") 20 km south of Buenos Aires.  This 1,500 km journey was made by foot, causing hundreds of Quilmes to die in the process.  By 1810, the reservation was abandoned as a result of its having become a ghost town.  The survivors ultimately settled in what is now the city of Quilmes.

Quilmes: Quilmes (] ) is a city in the province of Buenos Aires, Argentina , on the coast of the Rio de la Plata on the south east of the Greater Buenos Aires.  It is the capital of the borough Quilmes ("Partido de Quilmes"), and has a population of 230,810.  It is located 17 km south of the capital of Buenos Aires, the Autonomous City of Buenos Aires.

Pepsi Music Festival: The Pepsi Music Festival is a major Argentine music festival, held annually since 2003.  Since 2005 it has been named after its main sponsor, Pepsi; before it was named after its previous sponsor Quilmes, and it was known as "Quilmes Rock".  It was held in several places in Buenos Aires, including the Ferro Stadium and River Plate Stadium.  Since 2005 it has been held at Obras Stadium.  It's the largest and longest music festival in the country, with more than 200,000 people attending in 2006, during 10 days.

Supporting paragraphs: Quilmes Rock Cerveza Quilmes
Answer: Buenos Aires