Question: What is the starting date of exploitation visa number 21981 for the visual artwork whose script is written by Pier Paolo Pasolini?
Choices:
2001-01-03
1945-11-15
1960-05-09
1830-05-13
1647
1980-11-21
2013
2012
1984-01-01
2004-12-01
Program:
function: Find
inputs: Pier Paolo Pasolini
function: Relate
dependencies: 0
inputs: screenwriter
backward
function: FilterConcept
dependencies: 1
inputs: visual artwork
function: QueryAttrQualifier
dependencies: 2
inputs: exploitation visa number
21981
start time
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "visual artwork" . ?e <screenwriter> ?e_1 . ?e_1 <pred:name> "Pier Paolo Pasolini" .  ?e <exploitation_visa_number> ?pv . ?pv <pred:value> "21981" . [ <pred:fact_h> ?e ; <pred:fact_r> <exploitation_visa_number> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Answer: 1960-05-09