Question: who plays the first theme in eroica the first time
[{'answer': 'the cellos', 'provenance': [{'wikipedia_id': '242291', 'title': 'Symphony No. 3 (Beethoven)', 'start_paragraph_id': 12, 'start_character': 27, 'end_paragraph_id': 12, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Form.:I. Allegro con brio.:Exposition.\n'}]}, {'provenance': [{'wikipedia_id': '242291', 'title': 'Symphony No. 3 (Beethoven)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 378, 'bleu_score': 0.970362113628587, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1778811345873778410}, 'section': 'Section::::Form.:I. Allegro con brio.:Exposition.\n'}]}]