This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc. (W.B.C), Subject name: Pathology
[{'content': 'Best investigation for BCR-ABL \nSelect and explain. \nA. Flow cytometry, B. Fluorescent in situ hybridization, C. EISA, D. Polymerase chain reaction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Florescent in situ hybrdization(Ref: Robbins 9th/pg 170)In PCV: Reddening, swelling, and pain in the digits (erythromelalgia) may occur and are typically associated with extreme platelet elevations.', 'role': 'assistant'}]