Question: who discovered the magnetic field of electric current
[{'answer': 'Hans Christian Ørsted', 'provenance': [{'wikipedia_id': '36563', 'title': 'Magnetic field', 'start_paragraph_id': 9, 'start_character': 75, 'end_paragraph_id': 9, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]