Question: what is the size of a typical poster
[{'answer': '50 cm × 70 cm'}, {'provenance': [{'wikipedia_id': '166105', 'title': 'Paper size', 'start_paragraph_id': 61, 'start_character': 0, 'end_paragraph_id': 61, 'end_character': 859, 'bleu_score': 0.882413234461579, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11790107321496949716}, 'section': 'Section::::International paper sizes.:B series.\n'}]}]