Question: where are the mitochondria located in the sperm
[{'answer': 'midpiece', 'provenance': [{'wikipedia_id': '2324040', 'title': 'Sperm', 'start_paragraph_id': 11, 'start_character': 4, 'end_paragraph_id': 11, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Sperm in animals.:Anatomy.\n'}]}, {'answer': 'midpiece ( at the base of the sperm head )'}, {'provenance': [{'wikipedia_id': '2324040', 'title': 'Sperm', 'start_paragraph_id': 35, 'start_character': 0, 'end_paragraph_id': 35, 'end_character': 546, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10025909852061323195}, 'section': 'Section::::Motile sperm cells.\n'}]}, {'provenance': [{'wikipedia_id': '2324040', 'title': 'Sperm', 'section': 'Section::::Motile sperm cells.\n', 'start_paragraph_id': 35, 'end_paragraph_id': 35, 'meta': {'evidence_span': ["This takes place in the mitochondria located in the sperm's midpiece (at the base of the sperm head).", "mitochondria located in the sperm's midpiece"]}}]}, {'provenance': [{'wikipedia_id': '2324040', 'title': 'Sperm', 'section': 'Section::::Sperm in animals.:Anatomy.\n', 'start_paragraph_id': 11, 'end_paragraph_id': 11, 'meta': {'evidence_span': ['The midpiece has a central filamentous core with many mitochondria spiralled around it, used for ATP production for the journey through the female cervix, uterus and uterine tubes.', 'The midpiece has a central', 'The midpiece has a central filamentous core with many mitochondria spiralled around it, used for ATP production for the journey through the female cervix, uterus and uterine tubes.']}}]}]