Question: what was the original purpose of building chernobyl
[{'answer': 'nuclear reactor', 'provenance': [{'wikipedia_id': '29817198', 'title': 'Chernobyl Nuclear Power Plant sarcophagus', 'start_paragraph_id': 1, 'start_character': 125, 'end_paragraph_id': 1, 'end_character': 140, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29817198', 'title': 'Chernobyl Nuclear Power Plant sarcophagus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 465, 'bleu_score': 0.5587167650682221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1099864907854878302}, 'section': 'Section::::Abstract.'}]}]