Question: Since when was Northern Illinois University using 'Northern Illinois State Teachers College' as the official name ?
Choices: 2000-03-07
1999-01-31
1812-06-18
1921
1991-09-19
1902
2011-01-01
1997
2010-04-07
1989-11-09
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:name> "Northern Illinois University" . ?e <official_name> ?pv . ?pv <pred:value> "Northern Illinois State Teachers College" . [ <pred:fact_h> ?e ; <pred:fact_r> <official_name> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Northern Illinois University
function: QueryAttrQualifier
dependencies: 0
inputs: official name
Northern Illinois State Teachers College
start time
Answer: 1921