Question: who were the scientists who developed the cell theory
[{'answer': 'Theodor Schwann', 'provenance': [{'wikipedia_id': '102858', 'title': 'Cell theory', 'start_paragraph_id': 1, 'start_character': 901, 'end_paragraph_id': 1, 'end_character': 916, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Matthias Jakob Schleiden', 'provenance': [{'wikipedia_id': '102858', 'title': 'Cell theory', 'start_paragraph_id': 18, 'start_character': 90, 'end_paragraph_id': 18, 'end_character': 114, 'bleu_score': 1.0, 'section': 'Section::::Cell theory.\n'}]}, {'provenance': [{'wikipedia_id': '102858', 'title': 'Cell theory', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 1039, 'bleu_score': 0.988472140978305, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3984717253243586658}, 'section': 'Section::::Cell theory.\n'}]}]