Question: how long is a twin mattress in inches
[{'answer': '75 in', 'provenance': [{'wikipedia_id': '883640', 'title': 'Bed size', 'start_paragraph_id': 49, 'start_character': 194, 'end_paragraph_id': 49, 'end_character': 199, 'bleu_score': 1.0, 'section': 'Section::::Europe.:Northern Europe.\n'}]}]