Question: major veins that drain into the brachiocephalic veins
[{'answer': 'Left superior intercostal vein', 'provenance': [{'wikipedia_id': '242137', 'title': 'Brachiocephalic vein', 'start_paragraph_id': 8, 'start_character': 12, 'end_paragraph_id': 8, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Tributaries.\n'}]}, {'answer': 'Left and right inferior thyroid veins'}, {'answer': 'Left and right internal thoracic vein'}]