Question: the three basic types of protein fibers found in connective tissue are
[{'answer': 'Collagenous fibers', 'provenance': [{'wikipedia_id': '228845', 'title': 'Connective tissue', 'start_paragraph_id': 2, 'start_character': 77, 'end_paragraph_id': 2, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Elastic fibers', 'provenance': [{'wikipedia_id': '228845', 'title': 'Connective tissue', 'start_paragraph_id': 17, 'start_character': 687, 'end_paragraph_id': 17, 'end_character': 701, 'bleu_score': 1.0, 'section': 'Section::::Function.\n'}]}, {'answer': 'Reticular fibers', 'provenance': [{'wikipedia_id': '228845', 'title': 'Connective tissue', 'start_paragraph_id': 18, 'start_character': 40, 'end_paragraph_id': 18, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Function.\n'}]}]