Question: The 17th Premier of Nova Scotia and leader of the federal Progressive Conservative Party of Canada Robert Stanfield fought a few times and lost in general elections against which politician who is currently one of the longest-serving Prime Minister in Canadian history?
{'answer': 'Pierre Trudeau', 'supporting_facts': [['Robert Stanfield', 0], ['Robert Stanfield', 7], ['Pierre Trudeau', 0], ['Pierre Trudeau', 1]]}