Question: what two body systems are involved with ph balance
[{'answer': 'respiratory', 'provenance': [{'wikipedia_id': '8412074', 'title': 'Acid–base homeostasis', 'start_paragraph_id': 10, 'start_character': 145, 'end_paragraph_id': 10, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Acid–base balance.\n'}]}, {'answer': 'renal', 'provenance': [{'wikipedia_id': '8412074', 'title': 'Acid–base homeostasis', 'start_paragraph_id': 10, 'start_character': 173, 'end_paragraph_id': 10, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Acid–base balance.\n'}]}, {'provenance': [{'wikipedia_id': '8412074', 'title': 'Acid–base homeostasis', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 185, 'bleu_score': 0.729892616211392, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2613580449175437277}, 'section': 'Section::::Acid–base balance.\n'}]}]