What is the ethnicity of the author who wrote Gifted Hands?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q907311', 'id': 0, 'label': 'Netflix'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q2643241', 'id': 1, 'label': 'Gifted Hands: The Ben Carson Story'}], 'links': [{'name_': 'P750', 'source': 1, 'target': 0, 'label': 'distributed by'}]}