Question: who scored chelsea's first goal last season
[{'answer': 'Bertrand Traoré', 'provenance': [{'wikipedia_id': '50156011', 'title': '2016–17 Chelsea F.C. season', 'start_paragraph_id': 18, 'start_character': 191, 'end_paragraph_id': 18, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Month by month review.:July.\n'}]}, {'provenance': [{'wikipedia_id': '50156011', 'title': '2016–17 Chelsea F.C. season', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 456, 'bleu_score': 0.805850417097121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11037364462169142828}, 'section': 'Section::::Month by month review.:July.\n'}]}]