Question: what is the main muscle of the thigh
[{'answer': 'quadriceps femoris', 'provenance': [{'wikipedia_id': '911778', 'title': 'Quadriceps femoris muscle', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '911778', 'title': 'Quadriceps femoris muscle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 175, 'bleu_score': 0.816927647530702, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15486207434451053792}, 'section': 'Section::::Abstract.'}]}]