Question: who designed the transamerica building in san francisco
[{'answer': 'William Pereira', 'provenance': [{'wikipedia_id': '60868', 'title': 'Transamerica Pyramid', 'start_paragraph_id': 1, 'start_character': 653, 'end_paragraph_id': 1, 'end_character': 668, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '60868', 'title': 'Transamerica Pyramid', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 752, 'bleu_score': 0.7579358127836571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11837659701399759244}, 'section': 'Section::::Abstract.'}]}]