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: Forensic Medicine
Karyotyping of the 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: Although human chromosome may be visualized (karyotyping) in any growing tissue such as bone marrow, skin, fibroblast, amniotic fluid cells or chorionic villus; they are most conveniently studied in peripheral blood lymphocytes.