Question: what adds a phosphate group to adp to form atp
[{'answer': 'oxidative phosphorylation', 'provenance': [{'wikipedia_id': '58894', 'title': 'Phosphorylation', 'start_paragraph_id': 21, 'start_character': 162, 'end_paragraph_id': 21, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::ATP.\n'}]}, {'provenance': [{'wikipedia_id': '58894', 'title': 'Phosphorylation', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 265, 'bleu_score': 0.6750663886039721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 294761397695370020}, 'section': 'Section::::ATP.\n'}]}]