Question: How was it determined that the county of Massachusetts that contains Boston has a population of 722023?
Choices: Sixth National Population Census of the People's Republic of China
2000 United States Census
gross floor area
Canada 2011 Census
lead-lead dating
census
middle
FIFA World Rankings
extrapolation
tradition
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "county of Massachusetts" . ?e_1 <located_in_the_administrative_territorial_entity> ?e . ?e_1 <pred:name> "Boston" .  ?e <population> ?pv . ?pv <pred:unit> "1" . ?pv <pred:value> "722023"^^xsd:double . [ <pred:fact_h> ?e ; <pred:fact_r> <population> ; <pred:fact_t> ?pv ] <determination_method> ?qpv .  }
Program:
function: Find
inputs: Boston
function: Relate
dependencies: 0
inputs: located in the administrative territorial entity
forward
function: FilterConcept
dependencies: 1
inputs: county of Massachusetts
function: QueryAttrQualifier
dependencies: 2
inputs: population
722023
determination method
Answer: census