question: How many different keyboard players were official members of the Grateful Dead?
answerText: 5
questionEntity.name: Q212533
questionEntity.entityType: entity
questionEntity.label: Grateful Dead
questionEntity.mention: Grateful Dead
answerEntity.name: Q2165146
answerEntity.label: Ron "Pigpen" McKernan
answerEntity.name: Q322250
answerEntity.label: Tom Constanten
answerEntity.name: Q1351036
answerEntity.label: Keith Godchaux
answerEntity.name: Q909786
answerEntity.label: Brent Mydland
answerEntity.name: Q1936454
answerEntity.label: Vince Welnick