Question: the meridian opposite of earth's prime meridian
[{'answer': 'the 180th meridian', 'provenance': [{'wikipedia_id': '50225', 'title': 'Prime meridian', 'start_paragraph_id': 1, 'start_character': 177, 'end_paragraph_id': 1, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50225', 'title': 'Prime meridian', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 452, 'bleu_score': 0.8984691068229821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17310270629028212569}, 'section': 'Section::::Abstract.'}]}]