Question: when was the first eurovision song contest held
[{'answer': '1956', 'provenance': [{'wikipedia_id': '68311', 'title': 'Eurovision Song Contest 1956', 'start_paragraph_id': 0, 'start_character': 24, 'end_paragraph_id': 0, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '68311', 'title': 'Eurovision Song Contest 1956', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 189, 'bleu_score': 0.577797990263032, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12398448505085199091}, 'section': 'Section::::Abstract.'}]}]