Question: who was involved in the battle of lone pine
[{'answer': 'British Empire'}, {'answer': 'Ottoman Empire', 'provenance': [{'wikipedia_id': '417324', 'title': 'Battle of Lone Pine', 'start_paragraph_id': 1, 'start_character': 134, 'end_paragraph_id': 1, 'end_character': 148, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]