Question: how many nhl players have scored 50 goals in a season
[{'answer': 'Ninety - one', 'provenance': [{'wikipedia_id': '10630322', 'title': 'List of NHL players with 50-goal seasons', 'start_paragraph_id': 2, 'start_character': 439, 'end_paragraph_id': 2, 'end_character': 456, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10630322', 'title': 'List of NHL players with 50-goal seasons', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 538, 'bleu_score': 0.8243638954418021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10327386738003917999}, 'section': 'Section::::Abstract.'}]}]