Question: who was arsenal's top scorer in the 2017/18 premier league season
[{'answer': 'Alexandre Lacazette', 'provenance': [{'wikipedia_id': '54002853', 'title': '2017–18 Arsenal F.C. season', 'start_paragraph_id': 7, 'start_character': 168, 'end_paragraph_id': 7, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::Review.:July.\n'}]}]