Question: which american inventor invented the commercial telegraph based on joseph henry work
[{'answer': 'Samuel F.B. Morse'}, {'answer': 'Sir Charles Wheatstone', 'provenance': [{'wikipedia_id': '187477', 'title': 'Joseph Henry', 'start_paragraph_id': 1, 'start_character': 960, 'end_paragraph_id': 1, 'end_character': 982, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '187477', 'title': 'Joseph Henry', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 994, 'bleu_score': 0.970600465132858, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16409057083507631954}, 'section': 'Section::::Abstract.'}]}]