Question: who established the close connection between electricity and magnetism
[{'answer': 'Hans Christian Ørsted', 'provenance': [{'wikipedia_id': '7575091', 'title': 'Hans Christian Ørsted', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]