What is the tallest mountain in the U.S. state whose capital is Helena?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q3141549', 'id': 1, 'label': 'Howard Freeman'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q38733', 'id': 2, 'label': 'Helena'}, {'type': 'INTERNAL', 'name_': 'Q5281303', 'id': 3, 'label': 'Disappointment Peak'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q2078034', 'id': 4, 'label': 'Grand Teton'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P27', 'source': 1, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P19', 'source': 1, 'target': 2, 'label': 'place of birth'}, {'name_': 'P17', 'source': 3, 'target': 0, 'label': 'country'}, {'name_': 'P3137', 'source': 3, 'target': 4, 'label': 'parent peak'}]}