Question: when did india last win a hockey gold medal at the olympics
[{'answer': '1980', 'provenance': [{'wikipedia_id': '3888308', 'title': 'Field hockey at the Summer Olympics', 'start_paragraph_id': 4, 'start_character': 264, 'end_paragraph_id': 4, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]