Question: what are the 3 museums in the golden triangle of art in madrid
[{'answer': 'Prado Museum', 'provenance': [{'wikipedia_id': '15917156', 'title': 'Golden Triangle of Art', 'start_paragraph_id': 3, 'start_character': 13, 'end_paragraph_id': 3, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Reina Sofía Museum', 'provenance': [{'wikipedia_id': '15917156', 'title': 'Golden Triangle of Art', 'start_paragraph_id': 4, 'start_character': 13, 'end_paragraph_id': 4, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Thyssen - Bornemisza Museum'}]