Question: blood enters the left atrium from which vessel
[{'answer': 'lungs', 'provenance': [{'wikipedia_id': '1317242', 'title': 'Atrium (heart)', 'start_paragraph_id': 15, 'start_character': 514, 'end_paragraph_id': 15, 'end_character': 519, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Development.\n'}]}]