what is the name of the polling authority that ran the most recent election polls taken by nbc news?
Entity
m.017b3j
The Wall Street Journal
class class literal entity
government.polling_authority government.election_poll 0^^http://www.w3.org/2001/XMLSchema#int m.016bvz
government.polling_authority government.election_poll type.datetime government.polling_authority
Polling authority Election poll 0 NBC News
none none argmax none
government.polling_authority.polls government.election_poll.poll_start_date government.election_poll.taken_by
Election polls Poll start date Taken by
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :government.polling_authority . 
?x1 :type.object.type :government.election_poll . 
{
SELECT (MAX(?y2) AS ?x2)  WHERE { 
?y0 :type.object.type :government.polling_authority . 
?y1 :type.object.type :government.election_poll . 
VALUES ?y3 { :m.016bvz } 
?y0 :government.polling_authority.polls ?y1 . 
?y1 :government.election_poll.poll_start_date ?y2 . 
?y1 :government.election_poll.taken_by ?y3 . 
FILTER ( ?y0 != ?y1 && ?y0 != ?y2 && ?y0 != ?y3 && ?y1 != ?y2 && ?y1 != ?y3 && ?y2 != ?y3  )
}
}
VALUES ?x3 { :m.016bvz } 
?x0 :government.polling_authority.polls ?x1 . 
?x1 :government.election_poll.poll_start_date ?x2 . 
?x1 :government.election_poll.taken_by ?x3 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x0 != ?x3 && ?x1 != ?x2 && ?x1 != ?x3 && ?x2 != ?x3  )
}
}
(ARGMAX (AND government.polling_authority (JOIN government.polling_authority.polls (JOIN government.election_poll.taken_by m.016bvz))) (JOIN government.polling_authority.polls government.election_poll.poll_start_date))