Correct Answer: C

Rationale: Patients preparing for hematopoietic stem cell transplantation (HSCT) undergo intensive chemotherapy and/or radiation, which significantly suppresses their immune system. This immunosuppression leads to a heightened risk for infection, making it the most critical nursing diagnosis for these patients. As the body's ability to fight off pathogens is compromised, close monitoring and interventions aimed at preventing infections are essential for their safety and recovery.

Correct Answer: D

Rationale: In the Ann Arbor staging system for lymphomas, Stage 3 indicates that the disease has spread beyond the initial lymph node region to involve lymph nodes on both sides of the diaphragm (i.e., the areas above and below the diaphragm). This includes lymphatic involvement in both the thoracic and abdominal regions, signifying a more advanced disease state.

Correct Answer: B

Rationale: In North America, lung cancer is the leading cause of cancer deaths among both men and women, and the primary risk factor for lung cancer is smoking. Therefore, promoting smoking cessation is a critical public health intervention that directly addresses this significant health issue. By helping individuals quit smoking, healthcare providers can significantly reduce the incidence of lung cancer and associated deaths, making this intervention a priority in cancer prevention efforts.

Correct Answer: A

Rationale: Testicular cancer is indeed highly treatable and curable, particularly when detected early through regular self-examinations. The survival rates for testicular cancer are very high, with many cases being treatable even if the cancer has spread, thanks to effective treatment options such as surgery, chemotherapy, and radiation therapy. Educating clients on the importance of early detection through monthly testicular self-examinations can empower them to recognize any changes early, increasing the likelihood of successful treatment.

Correct Answer: A

Rationale: In patients with multiple myeloma, hypercalcemia is a common complication due to the release of calcium from the bones as a result of osteolytic lesions. One of the early symptoms of hypercalcemia is polyuria, or increased urine output. This occurs because elevated calcium levels can lead to impaired renal function and increased renal excretion of calcium, which results in increased urine production. Early recognition of polyuria can help prompt further evaluation and management of hypercalcemia, as untreated hypercalcemia can lead to more severe complications.