Question: what is the final electron acceptor in the electron transport chain of cellular respiration
[{'answer': 'other inorganic molecules', 'provenance': [{'wikipedia_id': '102871', 'title': 'Cellular respiration', 'start_paragraph_id': 7, 'start_character': 263, 'end_paragraph_id': 7, 'end_character': 288, 'bleu_score': 1.0, 'section': 'Section::::Aerobic respiration.\n'}]}, {'provenance': [{'wikipedia_id': '102871', 'title': 'Cellular respiration', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 616, 'bleu_score': 0.950027409461844, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15493075514308257978}, 'section': 'Section::::Aerobic respiration.\n'}]}]