Question: where did immigrants enter the us on the west coast
[{'answer': 'Angel Island Immigration Station', 'provenance': [{'wikipedia_id': '18611301', 'title': 'Angel Island Immigration Station', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'San Francisco Bay', 'provenance': [{'wikipedia_id': '18611301', 'title': 'Angel Island Immigration Station', 'start_paragraph_id': 1, 'start_character': 71, 'end_paragraph_id': 1, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Angel Island Immigration Station was an immigration station located in San Francisco Bay'}, {'provenance': [{'wikipedia_id': '18611301', 'title': 'Angel Island Immigration Station', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 635, 'bleu_score': 0.552722796124621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 811525365515981745}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18611301', 'title': 'Angel Island Immigration Station', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Angel Island Immigration Station was an immigration station', 'Angel Island Immigration Station was an immigration station located in San Francisco Bay which operated from January 21, 1910 to November 5, 1940, where immigrants entering the United States were detained and interrogated.', 'Angel Island Immigration Station was an immigration station located in San Francisco Bay which operated from January 21, 1910 to November 5, 1940, where immigrants entering the United States were detained and interrogated. Angel Island is an island in San Francisco Bay.']}}]}]