Question: when will the north west rail link be completed
[{'answer': '2019', 'provenance': [{'wikipedia_id': '16364200', 'title': 'Sydney Metro Northwest', 'start_paragraph_id': 2, 'start_character': 88, 'end_paragraph_id': 2, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]