Correct Answer: A

Rationale: While hair loss (alopecia) is a common side effect of chemotherapy due to the damage to rapidly dividing hair follicle cells, the statement that hair will grow back "immediately" is inaccurate and misleading. Hair regrowth after chemotherapy takes time, typically starting a few weeks to months after treatment ends. The new hair may also have a different texture or color initially. Therefore, this statement indicates a lack of understanding and could give the patient unrealistic expectations, which is why it shows incompetence.

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: Erythropoietin therapy is used to stimulate the production of red blood cells in patients with myelodysplastic syndrome (MDS), a disorder characterized by ineffective blood cell production, including red blood cells. The primary goal of erythropoietin therapy is to increase red blood cell count, improving the patient's oxygen-carrying capacity and reducing symptoms of anemia, such as fatigue and weakness. Monitoring hemoglobin levels is the best way to evaluate the effectiveness of this therapy because it directly reflects the patient's red blood cell count and the success of erythropoiesis (red blood cell production).

Correct Answer: C

Rationale: In multiple myeloma, the malignant proliferation of plasma cells within the bone marrow leads to the secretion of osteoclast-activating factors, which increase the breakdown of bone tissue (osteolysis). This results in decreased bone density, osteoporosis, and osteolytic lesions, making bones fragile and more prone to pathologic fractures. Patients with multiple myeloma are at high risk for fractures even with minimal trauma due to the weakened bone structure, which is why Risk for Injury is a key diagnosis.

Correct Answer: B

Rationale: Contact inhibition is a regulatory mechanism that prevents cells from proliferating once they reach a certain density. Normally, when cells grow and touch each other (such as in a monolayer), they stop dividing, maintaining tissue integrity and structure. When contact inhibition is lacking, as in many cancerous cells, cells continue to grow and divide uncontrollably, leading to tumor formation. This loss of regulation is a hallmark of cancerous growth.