Question: What country did James Watt come from that has London as its capital?
Answer(s):
answer: Kingdom of Great Britain

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.043rm)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.043rm ns:people.person.nationality ?x .
?x ns:location.country.capital ns:m.04jpl . 
}