Question: Since wen did a big city, where Nicholas II of Russia was born, use  Պետրոգրադ as the official name ?
Choices:
1914-08-31
1949-08-15
1839-01-08
1955-12-20
1887-09-20
2010-07-20
2005-01-08
1894-02-07
2012-04-02
1970-07-01
Answer: 1914-08-31
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "big city" . ?e_1 <place_of_birth> ?e . ?e_1 <pred:name> "Nicholas II of Russia" .  ?e <official_name> ?pv . ?pv <pred:value> "Պետրոգրադ" . [ <pred:fact_h> ?e ; <pred:fact_r> <official_name> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Nicholas II of Russia
function: Relate
dependencies: 0
inputs: place of birth
forward
function: FilterConcept
dependencies: 1
inputs: big city
function: QueryAttrQualifier
dependencies: 2
inputs: official name
Պետրոգրադ
start time