Question: where is the food stored in a yam plant
[{'answer': 'an edible tuber', 'provenance': [{'wikipedia_id': '3152275', 'title': 'Yam (vegetable)', 'start_paragraph_id': 13, 'start_character': 86, 'end_paragraph_id': 13, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::Description.\n'}]}, {'provenance': [{'wikipedia_id': '3152275', 'title': 'Yam (vegetable)', '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': 322133429810151362}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3152275', 'title': 'Yam (vegetable)', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 309, 'bleu_score': 0.965203995518735, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 322133429810151362}, 'section': 'Section::::Description.\n'}]}, {'provenance': [{'wikipedia_id': '3152275', 'title': 'Yam (vegetable)', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 391, 'bleu_score': 0.662179444966535, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 322133429810151362}, 'section': 'Section::::Description.\n'}]}, {'provenance': [{'wikipedia_id': '1414891', 'title': 'Yacón', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['The yacón, in contrast, is a close relative of the sunflower and Jerusalem artichoke. The plant produces a perennial rhizome to which are attached the edible, succulent storage roots, the principal economic product of the plant. The rhizome develops just under the surface of the soil and continuously produces aerial shoots. Dry and/or cold seasons cause the aerial shoots to die back, but the plant resprouts from the rhizome under favourable conditions of temperature and moisture. The edible storage tubers are large and typically weigh from a few hundred grams to a kilogram or so.', 'The plant produces a perennial rhizome to which are attached the edible, succulent storage roots, the principal economic product of the plant']}}]}, {'provenance': [{'wikipedia_id': '3152275', 'title': 'Yam (vegetable)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Yam is the common name for some plant species (at least eight) in the genus "Dioscorea" (family Dioscoreaceae) that form edible tubers.', 'Yam is the common name for some plant species (at least eight) in the genus "Dioscorea" (family Dioscoreaceae) that form edible tubers. Yams are perennial herbaceous vines cultivated for the consumption of their starchy tubers in many temperate and tropical world regions, especially Africa, Asia, and Oceania. The tubers themselves are called "yams", and there is a variety owing to numerous cultivars and related species.']}}]}, {'provenance': [{'wikipedia_id': '3152275', 'title': 'Yam (vegetable)', 'section': 'Section::::Description.\n', 'start_paragraph_id': 13, 'end_paragraph_id': 13, 'meta': {'evidence_span': ['A monocot related to lilies and grasses, yams are vigorous herbaceous vines providing an edible tuber. They are native to Africa, Asia, and the Americas. Some yams are also invasive plants, often considered a "noxious weed", outside cultivated areas. Yam tubers vary in size from that of a small potato to over .', 'A monocot related to lilies and grasses, yams are vigorous herbaceous vines providing an edible tuber.']}}]}]