**Question:** Which is not seen in multiple myeloma:

A. Hypercalcemia
B. Renal failure
C. Bone pain
D. Anemia

**Core Concept:** Multiple myeloma is a plasma cell disorder characterized by the clonal proliferation of malignant plasma cells in the bone marrow, leading to the production of a monoclonal protein (M-protein). This disease results in the imbalance of normal plasma cell function and leads to various clinical manifestations.

**Why the Correct Answer is Right:** Anemia is not typically seen in multiple myeloma, as the malignant plasma cells primarily affect the bone marrow, impairing the production of red blood cells (erythropoiesis) and leading to anemia. Hypercalcemia, renal failure, and bone pain are common complications of multiple myeloma due to factors such as hypercalcemia from parathyroid hormone-related protein, renal impairment due to the M-protein, and bone pain caused by osteolytic lesions in the bones.

**Why Each Wrong Option is Incorrect:**

Option A (Hypercalcemia) is incorrect because multiple myeloma can cause hypercalcemia due to the production of parathyroid hormone-related protein (PTHrP) by the malignant plasma cells.

Option B (Renal failure) can be incorrect in some cases, but renal failure is more often seen in advanced stages of multiple myeloma due to factors like hypercalcemia, acute kidney injury from cast nephropathy, or amyloidosis.

Option C (Bone pain) is correct as it is a common symptom of multiple myeloma due to osteolytic lesions and bone marrow involvement.

**Clinical Pearl:** Anemia is a critical component of the initial evaluation and monitoring of patients with suspected or confirmed multiple myeloma. Regular assessment of hemoglobin levels, serum creatinine, and calcium levels are essential to detect potential complications of the disease and guide treatment decisions.