question: Which US congressman has had the longest service as Speaker of the House?
answerText: Sam Rayburn
questionEntity.name: Q912994
questionEntity.entityType: entity
questionEntity.label: Speaker of the United States House of Representatives
questionEntity.mention: Speaker of the House
questionEntity.name: Q13218630
questionEntity.entityType: entity
questionEntity.label: United States representative
questionEntity.mention: US congressman
answerEntity.name: Q1378052
answerEntity.label: Samuel Taliaferro Rayburn