Question: When did Prince George's County start having 240 as its local dialing code?
Choices: 1920-04-25
1922-01-01
1997-06-01
1721-10-22
1971
2002-06-11
1991-05-13
2011-07-14
1904-01-01
2005-11-08
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:name> "Prince George's County" . ?e <local_dialing_code> ?pv . ?pv <pred:value> "240" . [ <pred:fact_h> ?e ; <pred:fact_r> <local_dialing_code> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Prince George's County
function: QueryAttrQualifier
dependencies: 0
inputs: local dialing code
240
start time
Answer: 1997-06-01