Question: Tell me the retrival date for the official website for Essens,  https://www.essen.de/
Choices:
2015-07-10
2018-06-24
2018-09-02
2017-06-24
2017-12-17
2017-06-17
2017-09-18
2017-06-16
2017-07-11
2017-05-07
Answer: 2017-09-18
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:name> "Essen" . ?e <official_website> ?pv . ?pv <pred:value> "https://www.essen.de/" . [ <pred:fact_h> ?e ; <pred:fact_r> <official_website> ; <pred:fact_t> ?pv ] <retrieved> ?qpv .  }
Program:
function: Find
inputs: Essen
function: QueryAttrQualifier
dependencies: 0
inputs: official website
https://www.essen.de/
retrieved