Question: the vascular layer of the eye is the
[{'answer': 'The uvea'}, {'answer': 'middle layer', 'provenance': [{'wikipedia_id': '974407', 'title': 'Uvea', 'start_paragraph_id': 4, 'start_character': 25, 'end_paragraph_id': 4, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Regions.\n'}]}, {'answer': 'uvea'}, {'provenance': [{'wikipedia_id': '974407', 'title': 'Uvea', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 119, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9374153892179860467}, 'section': 'Section::::Structure.:Regions.\n'}]}, {'provenance': [{'wikipedia_id': '974407', 'title': 'Uvea', 'section': 'Section::::Function.\n', 'start_paragraph_id': 12, 'end_paragraph_id': 12, 'meta': {'evidence_span': ["The uvea is the vascular middle layer of the eye. It is traditionally divided into three areas, from front to back, the: The prime functions of the uveal tract as a unit are: In addition, some uveal regions have special functions of great importance, including secretion of the aqueous humour by the ciliary processes, control of accommodation (focus) by the ciliary body, and optimisation of retinal illumination by the iris's control over the pupil. Many of these functions are under the control of the autonomic nervous system.", 'The uvea is the vascular middle layer of the eye', 'The uvea is the vascular middle layer of the eye']}}]}]