Question: where is located the center of the earth
[{'answer': 'Greenwich', 'provenance': [{'wikipedia_id': '35504712', 'title': 'Geographical centre of Earth', 'start_paragraph_id': 3, 'start_character': 515, 'end_paragraph_id': 3, 'end_character': 524, 'bleu_score': 1.0, 'section': 'Section::::History of the concept.\n'}]}, {'provenance': [{'wikipedia_id': '35504712', 'title': 'Geographical centre of Earth', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 855, 'bleu_score': 0.822731756546046, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4336812752400637245}, 'section': 'Section::::History of the concept.\n'}]}]