question: How many mainline Super Mario Brothers games were released on the original NES?
answerText: 3
questionEntity.name: Q172742
questionEntity.entityType: entity
questionEntity.label: Nintendo Entertainment System
questionEntity.mention: NES
questionEntity.name: Q23902998
questionEntity.entityType: entity
questionEntity.label: Super Mario Bros.
questionEntity.mention: Super Mario Brothers
answerEntity.name: Q11168
answerEntity.label: Super Mario Bros.
answerEntity.name: Q854479
answerEntity.label: Super Mario Bros. 2
answerEntity.name: Q639619
answerEntity.label: Super Mario Bros. 3