This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Karyotyping of foetus may be done from all of the following EXCEPT: \nSelect and explain. \nA. Lymphocyte, B. Monocyte, C. Amniocyte, D. Fibroblast', 'role': 'user'}, {'content': 'Answer: B \nExplanation: For Karyotyping, the cell needs to be arrested in the Metaphase stage for separating the chromosomes. The monocytes do not divide and therefore, they cannot be used for Karyotyping).', 'role': 'assistant'}]