Question: who starred in bill and ted's excellent adventure
[{'answer': 'Keanu Reeves', 'provenance': [{'wikipedia_id': '23808966', 'title': "Bill & Ted's Excellent Adventure", 'start_paragraph_id': 1, 'start_character': 174, 'end_paragraph_id': 1, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Alex Winter', 'provenance': [{'wikipedia_id': '23808966', 'title': "Bill & Ted's Excellent Adventure", 'start_paragraph_id': 1, 'start_character': 161, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'George Carlin', 'provenance': [{'wikipedia_id': '23808966', 'title': "Bill & Ted's Excellent Adventure", 'start_paragraph_id': 1, 'start_character': 192, 'end_paragraph_id': 1, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]