Question: how many litres is a formula 1 engine
[{'answer': '1.6 litre', 'provenance': [{'wikipedia_id': '11034903', 'title': 'Formula One engines', 'start_paragraph_id': 3, 'start_character': 27, 'end_paragraph_id': 3, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Operation.\n'}]}, {'provenance': [{'wikipedia_id': '11034903', 'title': 'Formula One engines', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 96, 'bleu_score': 0.861173529963367, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9958804883174796690}, 'section': 'Section::::Operation.\n'}]}]