Question: where does the atp needed to secrete hcl come from
[{'answer': 'the parietal cells', 'provenance': [{'wikipedia_id': '661769', 'title': 'Parietal cell', 'start_paragraph_id': 1, 'start_character': 455, 'end_paragraph_id': 1, 'end_character': 473, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '661769', 'title': 'Parietal cell', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 760, 'bleu_score': 0.9628278278632151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7539698039594536594}, 'section': 'Section::::Abstract.'}]}]