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: Pharmacology
[{'content': 'Siltuximab is used in treatment of ? \nSelect and explain. \nA. Castlemans disease, B. Sezary syndrome, C. Ankylosing spondylitis, D. Non hodgkins lymphoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Castleman's diseaselRef: Multiple myeloma, an issue of hematology oncology clinics E boohKenneth C Anderson p. 9171Siltuximab (Anti IL-6):IL-6 is produced by the stromal cells of the bone marrow, and plays a crucial role in the proliferation and survival of multiple myeloma cells.", 'role': 'assistant'}]