Open Era

Target entity: Open Era
Context triple: [Grand Slam tennis tournaments, includeProfessionalEra, Open Era]

• A. Modern era
  The Modern era is the historical period characterized by rapid industrialization, scientific and technological advancement, nation-state formation, and profound social and cultural change from roughly the late 18th century to the present.
• B. The National Era
  The National Era was a 19th-century American abolitionist newspaper best known as the original serial publisher of Harriet Beecher Stowe's "Uncle Tom's Cabin."
• C. New Era
  New Era is a barangay in Quezon City, Philippines, known for hosting the central offices and key facilities of the Iglesia ni Cristo religious organization.
• D. ERA
  ERA is the commonly used acronym for the European Research Area, a policy framework aimed at creating a unified research and innovation space across Europe.
• E. Common Era
  The Common Era (CE) is the widely used secular calendar era that counts years from the traditional date of the birth of Jesus, corresponding to the same years as AD in the Gregorian and Julian calendars.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: Open Era
Target entity description: The Open Era is the period in tennis history, beginning in 1968, when major tournaments allowed both amateur and professional players to compete together.

• A. Modern era
  The Modern era is the historical period characterized by rapid industrialization, scientific and technological advancement, nation-state formation, and profound social and cultural change from roughly the late 18th century to the present.
• B. The National Era
  The National Era was a 19th-century American abolitionist newspaper best known as the original serial publisher of Harriet Beecher Stowe's "Uncle Tom's Cabin."
• C. New Era
  New Era is a barangay in Quezon City, Philippines, known for hosting the central offices and key facilities of the Iglesia ni Cristo religious organization.
• D. ERA
  ERA is the commonly used acronym for the European Research Area, a policy framework aimed at creating a unified research and innovation space across Europe.
• E. Common Era
  The Common Era (CE) is the widely used secular calendar era that counts years from the traditional date of the birth of Jesus, corresponding to the same years as AD in the Gregorian and Julian calendars.
• F. None of above. chosen