Question: From which middle school did the public speaker that spoke about Education reform graduate?
Answer(s):
answer: Punahou School

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:event.public_speaker.speeches_or_presentations ?k .
?k ns:event.speech_or_presentation.speech_topic ns:m.02mdg . 
?c ns:people.person.education ?y .
?y ns:education.education.institution ?x .
?x ns:base.schemastaging.non_profit_extra.classification ns:m.0ppgt66 .
}