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
Ramesh 60 years, presents with generalized bone pain. On examination there is elevated ESR of 100 mm, serum globulin 7, lytic lesions in the skull, serum creatinine of 3.5 mg/dL and serum calcium of 11mg/dL. What is the most likely diagnosis - 
Select and explain. 
A. Waldenstrom's macroglobulinemia, B. Multiple myeloma, C. Hyperparathyroidism, D. Osteomalacia
B: Multiple myeloma
Answer: B: Multiple myeloma 
Explanation: None