Question: which country had access to an ocean in 1830 but is now landlocked
[{'answer': 'Bolivia', 'provenance': [{'wikipedia_id': '3462', 'title': 'Bolivia', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]