Question: who provided the labour to build the railroads in canada
[{'answer': 'European immigrants', 'provenance': [{'wikipedia_id': '5959', 'title': 'Canadian Pacific Railway', 'start_paragraph_id': 19, 'start_character': 59, 'end_paragraph_id': 19, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::History.:Building the railway, 1881–1885.\n'}]}, {'answer': 'workers from China', 'provenance': [{'wikipedia_id': '5959', 'title': 'Canadian Pacific Railway', 'start_paragraph_id': 19, 'start_character': 130, 'end_paragraph_id': 19, 'end_character': 148, 'bleu_score': 1.0, 'section': 'Section::::History.:Building the railway, 1881–1885.\n'}]}, {'provenance': [{'wikipedia_id': '5959', 'title': 'Canadian Pacific Railway', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 1528, 'bleu_score': 0.9572363948747751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13691721590603960180}, 'section': 'Section::::History.:Building the railway, 1881–1885.\n'}]}]