Question: who designed the bird's nest in beijing
[{'answer': 'Jacques Herzog', 'provenance': [{'wikipedia_id': '26207532', 'title': 'Beijing National Stadium', 'start_paragraph_id': 1, 'start_character': 168, 'end_paragraph_id': 1, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Pierre de Meuron', 'provenance': [{'wikipedia_id': '26207532', 'title': 'Beijing National Stadium', 'start_paragraph_id': 1, 'start_character': 187, 'end_paragraph_id': 1, 'end_character': 203, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Stefan Marbach', 'provenance': [{'wikipedia_id': '26207532', 'title': 'Beijing National Stadium', 'start_paragraph_id': 1, 'start_character': 245, 'end_paragraph_id': 1, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ai Weiwei', 'provenance': [{'wikipedia_id': '26207532', 'title': 'Beijing National Stadium', 'start_paragraph_id': 1, 'start_character': 268, 'end_paragraph_id': 1, 'end_character': 277, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Li Xinggang', 'provenance': [{'wikipedia_id': '26207532', 'title': 'Beijing National Stadium', 'start_paragraph_id': 1, 'start_character': 322, 'end_paragraph_id': 1, 'end_character': 333, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26207532', 'title': 'Beijing National Stadium', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 591, 'bleu_score': 0.8593354106829021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18381089005726333887}, 'section': 'Section::::Abstract.'}]}]