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': 'MYD88 L265P mutation is seen in? \nSelect and explain. \nA. Hairy cell leukemia, B. Waldenstrom Macroglobulinemia, C. Multiple Myeloma, D. AML', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Waldenstrom MacroglobulinemiaMYD88 (L265P) mutation is detectable in all patients with Waldenstro..m's macroglobulinemia, therefore representing a hallmark of the disease.", 'role': 'assistant'}]