Correct Answer: B

Rationale: An elevated white blood cell (WBC) count, also known as leukocytosis, is most commonly a response to infection. When the body detects an infection, the immune system responds by increasing the production of white blood cells to fight off the invading pathogens. The accompanying symptoms of fever and malaise are typical signs of infection, supporting the likelihood that this patient's health status is related to an infectious process rather than a more serious hematologic condition like lymphoma or leukemia.

Correct Answer: B

Rationale: Nausea and vomiting are among the most common and distressing side effects of chemotherapy. Chemotherapy drugs target rapidly dividing cells, including cancer cells, but they also affect healthy cells in the gastrointestinal (GI) tract, triggering the release of chemicals that stimulate the brain's vomiting center. These side effects can occur immediately (acute), be delayed, or even anticipatory, and often require management with antiemetic (anti-nausea) medications to improve the patient's comfort and quality of life during treatment.

Correct Answer: C

Rationale: Tumor lysis syndrome (TLS) is a potentially life-threatening condition that occurs when large numbers of cancer cells die rapidly, releasing their contents into the bloodstream. This can overwhelm the kidneys and lead to acute kidney injury. Creatinine is a waste product filtered out of the blood by the kidneys, and an elevated creatinine level is a sign of kidney dysfunction or damage. In TLS, increased creatinine levels indicate that the kidneys are struggling to filter out the excess waste products from cell breakdown, requiring immediate intervention to prevent further complications, such as acute renal failure.

Correct Answer: B

Rationale: Induction therapy for acute myeloid leukemia (AML) involves intensive chemotherapy aimed at achieving remission by eliminating a large number of cancerous cells. However, this aggressive treatment also severely reduces the production of healthy blood cells, including neutrophils, which leads to neutropenia (a dangerously low number of neutrophils). This makes the patient highly susceptible to infections, which can be life-threatening. Monitoring for signs of infection is critical during this phase, as infections may occur quickly and progress rapidly due to the compromised immune system. Early detection and prompt treatment of infections are vital to improving patient outcomes during induction therapy.

Correct Answer: D

Rationale: Multiple myeloma is a type of cancer that involves the malignant proliferation of plasma cells, which are a type of white blood cell that produces antibodies. In multiple myeloma, these abnormal plasma cells accumulate in the bone marrow, where they interfere with the production of normal blood cells and lead to the formation of tumors in the bones. This can cause bone pain, fractures, anemia, and impaired immune function. The excessive production of abnormal antibodies can also result in kidney damage and other systemic complications.