Question: where do they get the hair for a hair transplant
[{'answer': 'back of the head', 'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 1, 'start_character': 381, 'end_paragraph_id': 1, 'end_character': 397, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'chest', 'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 1, 'start_character': 517, 'end_paragraph_id': 1, 'end_character': 522, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'back', 'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 1, 'start_character': 381, 'end_paragraph_id': 1, 'end_character': 385, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'shoulders', 'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 30, 'start_character': 200, 'end_paragraph_id': 30, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Procedure.:Types of surgery.\n'}]}, {'answer': 'torso', 'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 30, 'start_character': 211, 'end_paragraph_id': 30, 'end_character': 216, 'bleu_score': 1.0, 'section': 'Section::::Procedure.:Types of surgery.\n'}]}, {'answer': 'legs', 'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 30, 'start_character': 224, 'end_paragraph_id': 30, 'end_character': 228, 'bleu_score': 1.0, 'section': 'Section::::Procedure.:Types of surgery.\n'}]}, {'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 229, 'bleu_score': 0.9419661180380051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17538141667071123726}, 'section': 'Section::::Procedure.:Harvesting methods.\n'}]}, {'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 658, 'bleu_score': 0.946668591300401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17538141667071123726}, 'section': 'Section::::Procedure.:Types of surgery.\n'}]}, {'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17538141667071123726}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 855, 'bleu_score': 0.985662154730604, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17538141667071123726}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'section': 'Section::::Procedure.:Types of surgery.\n', 'start_paragraph_id': 30, 'end_paragraph_id': 30, 'meta': {'evidence_span': ['If donor hair numbers from the back of the head are insufficient, it is possible to perform body hair transplantation (BHT) on appropriate candidates who have available donor hair on the chest, back, shoulders, torso and/or legs. Body hair transplant surgery can only be performed by the FUE harvesting method and, so, requires the skills of an experienced FUE surgeon.', 'If donor hair numbers from the back of the head are insufficient, it is possible to perform body hair transplantation (BHT) on appropriate candidates who have available donor hair on the chest, back, shoulders, torso and/or legs. Body hair transplant surgery can only be performed by the FUE harvesting method and, so, requires the skills of an experienced FUE surgeon. However, there are several factors for a potential BHT candidate to consider prior to surgery. These include understanding the natural difference in textural characteristics between body hair and scalp hair, growth rates, and having realistic expectations about the results of BHT surgery.', 'chest, back, shoulders, torso and/or legs']}}]}, {'provenance': [{'wikipedia_id': '2902770', 'title': 'Hair transplantation', 'section': 'Section::::History.\n', 'start_paragraph_id': 37, 'end_paragraph_id': 37, 'meta': {'evidence_span': ['The use of both scalp flaps, in which a band of tissue with its original blood supply is shifted to the continue bald area, and free grafts dates back to the 19th century. In 1897, Menahem Hodara successfully implanted hair taken from the unaffected areas of the scalp on to the scars that were left bald by favus. Modern transplant techniques began in Japan in the 1930s, where surgeons used small grafts, and even "follicular unit grafts" to replace damaged areas of eyebrows or lashes, but not to treat baldness.', 'The use of both scalp flaps, in which a band of tissue with its original blood supply is shifted to the continue bald area, and free grafts dates back to the 19th century. In 1897, Menahem Hodara successfully implanted hair taken from the unaffected areas of the scalp on to the scars that were left bald by favus. Modern transplant techniques began in Japan in the 1930s, where surgeons used small grafts, and even "follicular unit grafts" to replace damaged areas of eyebrows or lashes, but not to treat baldness. Their efforts did not receive worldwide attention at the time, and the traumas of World War II kept their advances isolated for another two decades.']}}]}]