Question: What is the formation date of the band that was nominated for a Grammy Award for Best Rap Performance by a Duo or Group?
Choices: 1991-12-25
1931-06-01
1806-01-01
1987
1789-09-26
1967-12-01
1999-12-20
1752-03-11
1993-11-16
1993-05-14
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "band" . ?e <nominated_for> ?e_1 . ?e_1 <pred:name> "Grammy Award for Best Rap Performance by a Duo or Group" .  ?e <inception> ?pv .  }
Program:
function: Find
inputs: Grammy Award for Best Rap Performance by a Duo or Group
function: Relate
dependencies: 0
inputs: nominated for
backward
function: FilterConcept
dependencies: 1
inputs: band
function: QueryAttr
dependencies: 2
inputs: inception
Answer: 1987