Question: who invented the first submarine used in war
[{'answer': 'British engineer Robert Whitehead', 'provenance': [{'wikipedia_id': '4551386', 'title': 'History of submarines', 'start_paragraph_id': 29, 'start_character': 196, 'end_paragraph_id': 29, 'end_character': 229, 'bleu_score': 1.0, 'section': 'Section::::Technology.:Mechanical power.\n'}]}, {'provenance': [{'wikipedia_id': '4551386', 'title': 'History of submarines', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 651, 'bleu_score': 0.8251872160815631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13248062312928756171}, 'section': 'Section::::Technology.:Mechanical power.\n'}]}]