Question: What date does the European Union start using Greek (whose country is the United Kingdom) as the official language?
Choices: 1990-09-23
1815-06-21
1981-01-01
1947
2003-12-26
2001-01-20
2010-09-07
1994-04-13
1856
1889-01-01
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e_1 <pred:name> "European Union" . ?e_2 <pred:name> "Greek" . ?e_2 <country> ?e_3 . ?e_3 <pred:name> "United Kingdom" . ?e_1 <official_language> ?e_2 . [ <pred:fact_h> ?e_1 ; <pred:fact_r> <official_language> ; <pred:fact_t> ?e_2 ] <start_time> ?qpv .  }
Program:
function: Find
inputs: European Union
function: Find
inputs: United Kingdom
function: Relate
dependencies: 1
inputs: country
backward
function: Find
inputs: Greek
function: And
dependencies: 2
3
function: QueryRelationQualifier
dependencies: 0
4
inputs: official language
start time
Answer: 1981-01-01