Question: how many goals has liverpool scored in the champions league this season
[{'answer': '15', 'provenance': [{'wikipedia_id': '54041666', 'title': '2017–18 Liverpool F.C. season', 'start_paragraph_id': 7, 'start_character': 944, 'end_paragraph_id': 7, 'end_character': 946, 'bleu_score': 1.0, 'section': 'Section::::Season review.:August.\n'}]}]