Question: who played the professor in gilligan's island
[{'answer': 'Russell David Johnson', 'provenance': [{'wikipedia_id': '946983', 'title': 'Russell Johnson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '946983', 'title': 'Russell Johnson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 207, 'bleu_score': 0.8783650674919871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16380138228424525097}, 'section': 'Section::::Abstract.'}]}]