Question: when was the wailing wall built in jerusalem
[{'answer': 'around 19 BCE', 'provenance': [{'wikipedia_id': '75225', 'title': 'Western Wall', 'start_paragraph_id': 2, 'start_character': 1109, 'end_paragraph_id': 2, 'end_character': 1122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '75225', 'title': 'Western Wall', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1495, 'bleu_score': 0.9922025803161881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7063977753186526185}, 'section': 'Section::::Abstract.'}]}]