Question: when did pokemon gold and silver come out
[{'answer': '2000', 'provenance': [{'wikipedia_id': '490832', 'title': 'Pokémon Gold and Silver', 'start_paragraph_id': 18, 'start_character': 839, 'end_paragraph_id': 18, 'end_character': 843, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}]