**Core Concept**
Multiple myeloma is a type of blood cancer characterized by the proliferation of malignant plasma cells in the bone marrow, leading to various systemic and skeletal complications. The disease is often associated with bone destruction, hypercalcemia, and anemia.

**Why the Correct Answer is Right**
Increased alkaline phosphatase (ALP) is not typically associated with multiple myeloma. ALP is an enzyme that is elevated in conditions involving bone growth or liver disease. In contrast, multiple myeloma is characterized by the destruction of bone tissue, which can lead to decreased ALP levels. This is because myeloma cells produce osteoclast-activating factors, which stimulate bone resorption and release of calcium into the bloodstream.

**Why Each Wrong Option is Incorrect**
**Option A:** Bone pain is a common symptom of multiple myeloma, resulting from the destruction of bone tissue and the release of osteoclast-activating factors.
**Option B:** Lytic lesions are characteristic of multiple myeloma, representing areas of bone destruction and cortical thinning.
**Option D:** Tartrate-resistant acid phosphatase (TRAP) positive myeloma cells are a subset of plasma cells that express TRAP, a marker associated with osteoclasts and bone resorption.

**Clinical Pearl / High-Yield Fact**
Multiple myeloma often presents with anemia, hypercalcemia, and renal impairment due to the production of light chains by malignant plasma cells, which can cause kidney damage and hypercalcemia.

**✓ Correct Answer: C. Increased alkaline phosphatase**