Question: who was the overall british commander of the gallipoli campaign
[{'answer': 'Roger Keyes', 'provenance': [{'wikipedia_id': '214109', 'title': 'Gallipoli campaign', 'start_paragraph_id': 16, 'start_character': 484, 'end_paragraph_id': 16, 'end_character': 495, 'bleu_score': 1.0, 'section': 'Section::::Naval campaign.:18 March 1915.\n'}]}, {'provenance': [{'wikipedia_id': '214109', 'title': 'Gallipoli campaign', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 983, 'bleu_score': 0.7926827215374711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15293101523017978756}, 'section': 'Section::::Naval campaign.:18 March 1915.\n'}]}]