Question: what was the smallest winning margin in the tour de france
[{'answer': "8 ''", 'provenance': [{'wikipedia_id': '39325799', 'title': 'Tour de France records and statistics', 'start_paragraph_id': 8, 'start_character': 679, 'end_paragraph_id': 8, 'end_character': 681, 'bleu_score': 1.0, 'section': 'Section::::Appearances.\n'}]}]