1.5-meter Tillinghast telescope

Target entity: 1.5-meter Tillinghast telescope
Context triple: [CfA Redshift Survey, usedInstrument, 1.5-meter Tillinghast telescope]

• A. 100-inch Hooker telescope
  The 100-inch Hooker telescope is a historic reflecting telescope at Mount Wilson Observatory, famous for Edwin Hubble’s observations that revealed the expanding universe and established galaxies beyond the Milky Way.
• B. Hale Telescope
  The Hale Telescope is a historic 200-inch reflecting telescope at Palomar Observatory in California that was once the world’s largest and remains a landmark instrument in observational astronomy.
• C. Dall–Kirkham telescope
  The Dall–Kirkham telescope is a reflecting telescope design that uses an elliptical primary mirror and spherical secondary mirror to provide good on-axis performance with relatively simple, economical optics.
• D. Nicholas U. Mayall Telescope
  The Nicholas U. Mayall Telescope is a 4-meter-class optical telescope at Kitt Peak National Observatory in Arizona, widely used for large-scale astronomical surveys and cosmological research.
• E. Otto Struve Telescope
  The Otto Struve Telescope is a historic 2.1-meter reflecting telescope at McDonald Observatory in Texas, notable for being one of the largest telescopes in the world when it began operation in the late 1930s.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: 1.5-meter Tillinghast telescope
Target entity description: The 1.5-meter Tillinghast telescope is an optical reflecting telescope at the Fred Lawrence Whipple Observatory that has been widely used for spectroscopic and redshift measurements in extragalactic astronomy.

• A. 100-inch Hooker telescope
  The 100-inch Hooker telescope is a historic reflecting telescope at Mount Wilson Observatory, famous for Edwin Hubble’s observations that revealed the expanding universe and established galaxies beyond the Milky Way.
• B. Hale Telescope
  The Hale Telescope is a historic 200-inch reflecting telescope at Palomar Observatory in California that was once the world’s largest and remains a landmark instrument in observational astronomy.
• C. Dall–Kirkham telescope
  The Dall–Kirkham telescope is a reflecting telescope design that uses an elliptical primary mirror and spherical secondary mirror to provide good on-axis performance with relatively simple, economical optics.
• D. Nicholas U. Mayall Telescope
  The Nicholas U. Mayall Telescope is a 4-meter-class optical telescope at Kitt Peak National Observatory in Arizona, widely used for large-scale astronomical surveys and cosmological research.
• E. Otto Struve Telescope
  The Otto Struve Telescope is a historic 2.1-meter reflecting telescope at McDonald Observatory in Texas, notable for being one of the largest telescopes in the world when it began operation in the late 1930s.
• F. None of above. chosen