Question: When did Arlington County start using the local dialing code 571?
Choices: 2004-07-30
1988-02-18
1919-08-08
1954-12-30
1961-01-20
2000-03-01
1995-10-14
1978-10-10
2012-06-19
1919-09-10
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:name> "Arlington County" . ?e <local_dialing_code> ?pv . ?pv <pred:value> "571" . [ <pred:fact_h> ?e ; <pred:fact_r> <local_dialing_code> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Arlington County
function: QueryAttrQualifier
dependencies: 0
inputs: local dialing code
571
start time
Answer: 2000-03-01