«A» questions were important questions for which summary tables already existed from other authoritative reports. (health.gov)
The most authoritative report on diet and cancer in history was published in 1997; the World Cancer Research Fund's tome, which reviewed essentially every study on diet and cancer ever published. (nutritionfacts.org)
The IPCC was set up in 1988 to provide the most authoritative report on global climate change, enabling governments to prepare for a future of rising seas, droughts, extreme weather events, and other consequences. (theguardian.com)