This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plasma Cell Disorders and Multiple myeloma, Subject name: Pathology
Proliferation and survival of myeloma cells are dependent on which of the following cytokines? 
Select and explain. 
A. IL-1, B. IL-6, C. IL-2, D. IL-5
B: IL-6
Answer: B: IL-6 
Explanation: IL-6 helps in survival and proliferation of myeloma cells Other options: IL 5 - chemoattractant for eosinophils IL-1 - recruits leukocytes and thus induces inflammation IL-2 - a growth factor for T lymphocytes