Question: when did the british army start wearing khaki
[{'answer': 'early 1900s', 'provenance': [{'wikipedia_id': '7945090', 'title': 'Service Dress (British Army)', 'start_paragraph_id': 1, 'start_character': 124, 'end_paragraph_id': 1, 'end_character': 135, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7945090', 'title': 'Service Dress (British Army)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 330, 'bleu_score': 0.9063371597260741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5511967833657923158}, 'section': 'Section::::Abstract.'}]}]