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
[{'content': 'A 60 year old man presented with fatigue, weight loss and heaviness in left hypochondrium for 6 months. The hemogram showed Hb. 10gm/dL, TLC 5 lakhs/mm3, platelet count 4 lakhs/mm3, DLC; neutrophil 55%, lymphocytes 4%, monocytes 2%, basophils 6%, metamyelocytes 10%, myelocytes 18%, promyelocytes 2% and blasts 3%. The most likely cytogenetic abnormality in this case is - \nSelect and explain. \nA. t (1; 21), B. t (9; 22), C. t (15; 17), D. Trisomy 21', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]