Question: when does a cell have condensed visible chromosomes also known as sister chromatids
[{'answer': 'metaphase', 'provenance': [{'wikipedia_id': '6438', 'title': 'Chromosome', 'start_paragraph_id': 2, 'start_character': 95, 'end_paragraph_id': 2, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6438', 'title': 'Chromosome', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 853, 'bleu_score': 0.9121739425047221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8993122008645591493}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6438', 'title': 'Chromosome', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8993122008645591493}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6438', 'title': 'Chromosome', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['During metaphase the X-shape structure is called a metaphase chromosome.', 'Chromosomes are normally visible under a light microscope only when the cell is undergoing the metaphase of cell division (where all chromosomes are aligned in the center of the cell in their condensed form).', 'Chromosomes are normally visible under a light microscope only when the cell is undergoing the metaphase']}}]}]