What is the newest of the four ancient universities of Scotland?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q22', 'id': 0, 'label': 'Scotland'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q160302', 'id': 1, 'label': 'University of Edinburgh'}, {'type': 'INTERNAL', 'name_': 'Q21601', 'id': 2, 'label': 'Dorothy Donaldson Buchanan'}], 'links': [{'name_': 'P27', 'source': 2, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P69', 'source': 2, 'target': 1, 'label': 'educated at'}]}