Question: where do the blood vessels that supply the retinal cells lie
[{'answer': 'optic nerve', 'provenance': [{'wikipedia_id': '48334', 'title': 'Retina', 'start_paragraph_id': 3, 'start_character': 198, 'end_paragraph_id': 3, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'The optic nerve'}, {'answer': "the ophthalmic artery bifurcates and supplies the retina via two distinct vascular networks : the choroidal network , which supplies the choroid and the outer retina , and the retinal network , which supplies the retina 's inner layer"}, {'provenance': [{'wikipedia_id': '48334', 'title': 'Retina', 'start_paragraph_id': 42, 'start_character': 0, 'end_paragraph_id': 42, 'end_character': 849, 'bleu_score': 0.984789766484456, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8206166484355838921}, 'section': 'Section::::Structure.:Blood supply.:Circulatory mechanisms.\n'}]}, {'provenance': [{'wikipedia_id': '48334', 'title': 'Retina', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 431, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8206166484355838921}, 'section': 'Section::::Structure.:Blood supply.\n'}]}, {'provenance': [{'wikipedia_id': '48334', 'title': 'Retina', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 662, 'bleu_score': 0.9591116223104591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8206166484355838921}, 'section': 'Section::::Structure.:Retinal layers.\n'}]}, {'provenance': [{'wikipedia_id': '48334', 'title': 'Retina', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8206166484355838921}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1061967', 'title': 'Optic disc', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['presents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together. The optic disc is also the entry point for the major blood vessels that supply the retina. The optic disc in a normal human eye carries 11.2 million afferent nerve fibers f', 'The optic disc is also the entry point for the major blood vessels that supply the retina.', 'The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye. Because there are no rods or cones overlying the optic disc, it corresponds to a small blind spot in each eye. The ganglion cell axons form the optic nerve after they leave the eye. The optic disc represents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together. The optic disc is also t']}}]}]