Question: what is the latest volume of the walking dead
[{'answer': 'Volume 29', 'provenance': [{'wikipedia_id': '2202814', 'title': 'The Walking Dead (comic book)', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Story arcs.\n'}]}]