Question: what goes in and comes out of the electron transport chain
[{'answer': 'electrons from NADH and FADH2', 'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 9, 'start_character': 184, 'end_paragraph_id': 9, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::In mitochondria.\n'}]}, {'answer': 'produce ATP', 'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 9, 'start_character': 47, 'end_paragraph_id': 9, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::In mitochondria.\n'}]}, {'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1085, 'bleu_score': 0.972403621987549, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3180816709656556732}, 'section': 'Section::::In mitochondria.\n'}]}]