Question: how many countries are taking part in eurovision 2018
[{'answer': 'forty - two', 'provenance': [{'wikipedia_id': '52859040', 'title': 'Eurovision Song Contest 2018', 'start_paragraph_id': 34, 'start_character': 42, 'end_paragraph_id': 34, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Participating countries.\n'}]}, {'provenance': [{'wikipedia_id': '52859040', 'title': 'Eurovision Song Contest 2018', 'start_paragraph_id': 34, 'start_character': 0, 'end_paragraph_id': 34, 'end_character': 507, 'bleu_score': 0.9132688781618751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12081908100814297618}, 'section': 'Section::::Participating countries.\n'}]}]