Question: who won silver medal in world badminton championship
[{'answer': 'Pusarla Venkata Sindhu', 'provenance': [{'wikipedia_id': '29274314', 'title': 'P. V. Sindhu', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29274314', 'title': 'P. V. Sindhu', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 472, 'bleu_score': 0.5713202450053191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4484360692743584651}, 'section': 'Section::::Abstract.'}]}]