Question: in which city royal observatory greenwich is situated
[{'answer': 'Greenwich', 'provenance': [{'wikipedia_id': '43989', 'title': 'Royal Observatory, Greenwich', 'start_paragraph_id': 0, 'start_character': 19, 'end_paragraph_id': 0, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]