Question: when did the battle of the bulge start
[{'answer': '16 December 1944', 'provenance': [{'wikipedia_id': '57998', 'title': 'Battle of the Bulge', 'start_paragraph_id': 1, 'start_character': 177, 'end_paragraph_id': 1, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]