Question: when did pakistan won olympic gold medal in hockey for the first time
[{'answer': '1960', 'provenance': [{'wikipedia_id': '14768644', 'title': 'Pakistan at the Olympics', 'start_paragraph_id': 4, 'start_character': 70, 'end_paragraph_id': 4, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]