Question: who was the first lord of the admiralty at the time of the lusitania's sinking
[{'answer': 'Winston Churchill', 'provenance': [{'wikipedia_id': '35695594', 'title': 'Sinking of the RMS Lusitania', 'start_paragraph_id': 100, 'start_character': 949, 'end_paragraph_id': 100, 'end_character': 966, 'bleu_score': 1.0, 'section': 'Section::::Official inquiries into the sinking.:Board of Trade investigation.\n'}]}, {'provenance': [{'wikipedia_id': '35695594', 'title': 'Sinking of the RMS Lusitania', 'start_paragraph_id': 100, 'start_character': 0, 'end_paragraph_id': 100, 'end_character': 1327, 'bleu_score': 0.9532422126697361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2132608093350361072}, 'section': 'Section::::Official inquiries into the sinking.:Board of Trade investigation.\n'}]}]