answerEntity: Battle of Antietam
graph: {'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q178561', 'id': 0, 'label': 'battle'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q719252', 'id': 1, 'label': 'Battle of Antietam'}], 'links': [{'name_': 'P31', 'source': 1, 'target': 0, 'label': 'instance of'}]}