Question: When did Robert Silverberg win the  Nebula Award for Best Novel?
Choices:
1971
2003-12-06
1998-03-18
1963-01-01
1727-12-01
2007-06-28
1873
2011-03-09
1969
1996-03-25
Program:
function: Find
inputs: Nebula Award for Best Novel
function: Find
inputs: Robert Silverberg
function: QueryRelationQualifier
dependencies: 0
1
inputs: winner
point in time
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e_1 <pred:name> "Nebula Award for Best Novel" . ?e_2 <pred:name> "Robert Silverberg" . ?e_1 <winner> ?e_2 . [ <pred:fact_h> ?e_1 ; <pred:fact_r> <winner> ; <pred:fact_t> ?e_2 ] <point_in_time> ?qpv .  }
Answer: 1971