Correct Answer: C

Rationale: Prophylactic surgery refers to the preventive removal of tissues or organs at high risk for developing cancer, even when no cancer is currently present. In this case, the patient has a positive breast tumor marking test and a significant family history of breast cancer, which places her at increased risk for developing the disease. A bilateral mastectomy is performed to significantly reduce this risk by removing both breasts, thereby preventing the potential future occurrence of breast cancer.

Correct Answer: C

Rationale: Thrombocytopenia is a condition characterized by a low platelet count, which increases the risk of bleeding and hemorrhage. Patients receiving chemotherapy agents like carmustine may experience thrombocytopenia as a significant side effect. Epistaxis (nosebleeds) is a common symptom associated with thrombocytopenia, as the blood vessels can become more fragile, and even minor trauma or spontaneous bleeding can occur. Therefore, assessing for signs of bleeding, including epistaxis, is crucial in patients at risk for thrombocytopenia.

Correct Answer: B

Rationale: In the case of lung cancer that has metastasized to the bones and liver, lymphatic circulation is a key mechanism by which cancer cells spread from the primary tumor site to distant organs. Cancer cells can invade nearby lymphatic vessels and travel through the lymphatic system, eventually reaching lymph nodes and spreading to other tissues and organs. This route is significant in the metastasis of many types of cancer, including lung cancer.

Correct Answer: B

Rationale: Electrolytes and uric acid levels are important to monitor for the development of tumor lysis syndrome.

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.