Question: which part of the nephron does antidiuretic hormone act upon
[{'answer': 'the kidney tubules', 'provenance': [{'wikipedia_id': '222299', 'title': 'Vasopressin', 'start_paragraph_id': 1, 'start_character': 551, 'end_paragraph_id': 1, 'end_character': 569, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '222299', 'title': 'Vasopressin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 703, 'bleu_score': 0.9584111476786991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13561880145366319765}, 'section': 'Section::::Abstract.'}]}]