Question: what is the meat in a reuben sandwich
[{'answer': 'corned beef ,', 'provenance': [{'wikipedia_id': '318892', 'title': 'Reuben sandwich', 'start_paragraph_id': 22, 'start_character': 98, 'end_paragraph_id': 22, 'end_character': 114, 'bleu_score': 1.0, 'section': 'Section::::Variations.:Rachel sandwich.\n'}]}, {'provenance': [{'wikipedia_id': '318892', 'title': 'Reuben sandwich', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 0.723292776655117, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5909046310058592326}, 'section': 'Section::::Abstract.'}]}]