This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
For karyotyping, the dividing cells are arrested by the addition of colchicines in the following mitotic phase 
Select and explain. 
A. Prophase, B. Metaphase, C. Anaphase, D. Telophase
B: Metaphase
Answer: B: Metaphase 
Explanation: b. Metaphase(Ref: Nelson's 20/e p 605-606, Ghai 8/e p 645)Chromosomes are examined after arresting dividing cells in metaphase with mitotic spindle inhibitors (e.g., N-diacetyl- N-methylcolchicine), followed by staining.