Pathology Misc. (W.B.C) 194e56bb Multiple myeloma is a tumor of? A B-lymphocyte B T-lymphocyte C Lymph nodes D Plasma cell High-Yield Explanation Ans. (d) Plasma cell(Ref: Robbins 9th/pg 598-602)Multiple myeloma is a malignant proliferation of plasma cells derived from a single clone.