Question: fc barcelona top goal scorer of all time
[{'answer': 'Lionel Messi', 'provenance': [{'wikipedia_id': '14707564', 'title': 'List of FC Barcelona records and statistics', 'start_paragraph_id': 41, 'start_character': 52, 'end_paragraph_id': 41, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Players records.:Top goalscorers.:All competitions.\n'}]}]