Question: who leads the elves to helm's deep
[{'answer': 'Haldir of Lórien', 'provenance': [{'wikipedia_id': '426975', 'title': 'Battle of the Hornburg', 'start_paragraph_id': 31, 'start_character': 505, 'end_paragraph_id': 31, 'end_character': 521, 'bleu_score': 1.0, 'section': 'Section::::Adaptations.:Peter Jackson\'s "Battle of Helm\'s Deep".\n'}]}, {'provenance': [{'wikipedia_id': '426975', 'title': 'Battle of the Hornburg', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 975, 'bleu_score': 0.988269287301458, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2654561821916167019}, 'section': 'Section::::Adaptations.:Peter Jackson\'s "Battle of Helm\'s Deep".\n'}]}]