Question: where did the allies hold the german advance at the battle of bulge
[{'answer': 'Siegfried Line', 'provenance': [{'wikipedia_id': '57998', 'title': 'Battle of the Bulge', 'start_paragraph_id': 2, 'start_character': 2102, 'end_paragraph_id': 2, 'end_character': 2116, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57998', 'title': 'Battle of the Bulge', 'start_paragraph_id': 2, 'start_character': 45, 'end_paragraph_id': 2, 'end_character': 1235, 'bleu_score': 0.6976371779522861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15658339325853598287}, 'section': 'Section::::Abstract.'}]}]