Question: The art series The Back Series was created by what sort of visual artist?
Answer(s):
answer: Collage
answer: Drawing
answer: Painting
answer: Sculpture
answer: Printmaking

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:visual_art.visual_artist.art_series ns:m.0gj8w8y . 
?c ns:visual_art.visual_artist.art_forms ?x .
}