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: Medicine
[{'content': 'All are true for Philadelphia chromosome, EXCEPT \nSelect and explain. \nA. Acquired genetic defect, B. Seen in plasma cell tumors, C. It is a marker of CML, D. Translocation of chromosome from 22 to Ch. 9', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]