Question: Barry James O'Sullivan, an Australian politician, a former police detective, grazier, property developer and LNP executive treasurer, O'Sullivan was appointed by the Queensland Parliament to the Senate seat vacated by which Australian politician who has served as the Deputy Prime Minister of Australia?
Sentence (from "Deputy Prime Minister of Singapore"): The Deputy Prime Minister of the Republic of Singapore is the deputy head of the government of the Republic of Singapore.
Relevant evidence: No