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
In philadelphia chromosome the defect is in - 
Select and explain. 
A. Short arm of chromosome 22, B. Long arm of chromosome 22, C. Short arm of chromosome 9, D. Chromosome 21
B: Long arm of chromosome 22
Answer: B: Long arm of chromosome 22 
Explanation: None