Question: when did turkey become a candidate for the eu
[{'answer': '12 December 1999', 'provenance': [{'wikipedia_id': '1283036', 'title': 'Accession of Turkey to the European Union', 'start_paragraph_id': 1, 'start_character': 548, 'end_paragraph_id': 1, 'end_character': 564, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1283036', 'title': 'Accession of Turkey to the European Union', 'start_paragraph_id': 1, 'start_character': 43, 'end_paragraph_id': 1, 'end_character': 612, 'bleu_score': 0.890131404552139, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15674562363650892815}, 'section': 'Section::::Abstract.'}]}]