Question: when was the first gas field discovered in bangladesh
[{'answer': '1955', 'provenance': [{'wikipedia_id': '46776210', 'title': 'Natural gas and petroleum in Bangladesh', 'start_paragraph_id': 4, 'start_character': 197, 'end_paragraph_id': 4, 'end_character': 201, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '46776210', 'title': 'Natural gas and petroleum in Bangladesh', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 339, 'bleu_score': 0.965203995518735, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16701897188066145171}, 'section': 'Section::::History.\n'}]}]