Question: What is the office of the head of the organization and the seat of the Commonwealth of Nations?
Paraphrase: Who is the president of the Commonwealth of Nations?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q7785 wdt:P2388 ?ans_1 . wd:Q7785 wdt:P159 ?ans_2 }
Answer: Head of the Commonwealth, Marlborough House