Question: what structure is located in the upper third of the sternocleidomastoid muscle
[{'answer': 'The clavicular head', 'provenance': [{'wikipedia_id': '465415', 'title': 'Sternocleidomastoid muscle', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'provenance': [{'wikipedia_id': '465415', 'title': 'Sternocleidomastoid muscle', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 181, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8666571999265357630}, 'section': 'Section::::Structure.\n'}]}]