Question: when did germany signed the treaty of versailles
[{'answer': '28 June 1919', 'provenance': [{'wikipedia_id': '30030', 'title': 'Treaty of Versailles', 'start_paragraph_id': 1, 'start_character': 199, 'end_paragraph_id': 1, 'end_character': 211, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30030', 'title': 'Treaty of Versailles', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 673, 'bleu_score': 0.8530848213519411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4852194900066075144}, 'section': 'Section::::Abstract.'}]}]