Question: which type of ships are used for lng transportation
[{'answer': 'tank ship', 'provenance': [{'wikipedia_id': '12378960', 'title': 'LNG carrier', 'start_paragraph_id': 1, 'start_character': 20, 'end_paragraph_id': 1, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12378960', 'title': 'LNG carrier', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 185, 'bleu_score': 0.934334813046729, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16562722932903714702}, 'section': 'Section::::Abstract.'}]}]