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': "'Hairy cell leukemia' is a Neoplastic proliferation of : \nSelect and explain. \nA. T. cells, B. B. cells, C. Myeloid cells, D. Macrophages", 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (B Cells) Wain' Cell is a rare hut distinctive B-cell neoplasm. Hairy cell leukemia review : Presentation is with a triad of : Splenomegaly Q :often massive. However hepatomegaly is less common while lymphadenopathy is rare. Pancytopenia Q and thereby, resulting infections. Vasculitis like syndrome Q :Erythema nodosum and cutaneous nodules due to perivasculitis and PAN. Course : Hairy cell leukemia follows an indolent course.Q", 'role': 'assistant'}]