Question: where are the world athletics championships 2017 being held
[{'answer': 'London', 'provenance': [{'wikipedia_id': '32967952', 'title': '2017 World Championships in Athletics', 'start_paragraph_id': 1, 'start_character': 175, 'end_paragraph_id': 1, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32967952', 'title': '2017 World Championships in Athletics', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 275, 'bleu_score': 0.953991849837532, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1282277799843414319}, 'section': 'Section::::Abstract.'}]}]