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
Ramla, 65 yrs old male presents with low backpain especially at L3, anaemia and fatiguability) His investigation profile reveals -Hb =7gm%, TLC-9000/cmm, DLC -N- 55%, L-30%, M-10%, E-1%, -2%,Serum proteins-8gm %, ratio-2.9/5.9, ESR-90 and serum creatinine-3.2 mg%. Likely diagnosis is - 
Select and explain. 
A. Waldenstroms macroglobulinemia, B. Multiple myeloma, C. TB spine, D. Secondaries in spine
B: Multiple myeloma
Answer: B: Multiple myeloma 
Explanation: None