Question: what city did the northern pacific railroad choose for its terminus in 1873
[{'answer': 'Tacoma , Washington', 'provenance': [{'wikipedia_id': '498246', 'title': 'Northern Pacific Railway', 'start_paragraph_id': 86, 'start_character': 17, 'end_paragraph_id': 86, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Divisions.:Tacoma.\n'}]}]