Hematology MCQ for NEET PG & FMGE

A 56-year-old male presents with progressive anemia for 1 year and severe low back pain for 3 months. Lab findings: hemoglobin 89g/L, WBC 3.4×10<sup>9</sup>/L, platelets 68×10<sup>9</sup>/L, ESR 180mm/h, urinary protein (++). Bone marrow shows 54% abnormal plasma cells, and serum protein electrophoresis (SPEP) reveals monoclonal protein (M protein). The most likely diagnosis is:

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