Question: where is the darth vader gargoyle on the national cathedral
[{'answer': 'northwest tower', 'provenance': [{'wikipedia_id': '33012056', 'title': 'Darth Vader grotesque', 'start_paragraph_id': 3, 'start_character': 45, 'end_paragraph_id': 3, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33012056', 'title': 'Darth Vader grotesque', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 421, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 342664766471170487}, 'section': 'Section::::Abstract.'}]}]