original question: Which survey is done in [Cerro Tololo Inter-American Observatory]
answer: 2mass
answer type: Astronomical Survey/Project Organization.
auxiliary information: The Cerro Tololo Inter-American Observatory is an astronomical observatory located on Cerro Tololo in the Coquimbo Region of northern Chile, with additional facilities located on Cerro Pach√≥n about 10 kilometres to the southeast. It is within the Coquimbo Region and approximately 80 kilometres east of La Serena, where support facilities are located. The site was identified by a team of scientists from Chile and the United States in 1959, and it was selected in 1962. Construction began in 1963 and regular astronomical observations commenced in 1965. Construction of large buildings on Cerro Tololo ended with the completion of the V√≠ctor M. Blanco Telescope in 1974, but smaller facilities have been built since then. Cerro Pach√≥n is still under development, with two large telescopes inaugurated since 2000, and one in the early stages of construction. The principal telescopes at CTIO are the 4 m V√≠ctor M. Blanco Telescope, named after Puerto Rican astronomer Victor Manuel Blanco, and the 4.1 m Southern Astrophysical Research telescope, which is situated on Cerro Pach√≥n.
[Cerro Tololo Inter-American Observatory] is responsible for executing what survey?