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: Pathology
Chromosomal abnormality seen in promyelocytic 
Select and explain. 
A. 17-15t, B. 21-9t, C. 22-9t, D. None of the above
A: 17-15t
Answer: A: 17-15t 
Explanation: None