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
Karyotyping of foetus may be done from all of the following EXCEPT: 
Select and explain. 
A. Lymphocyte, B. Monocyte, C. Amniocyte, D. Fibroblast
B: Monocyte
Answer: B: Monocyte 
Explanation: 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).