Correct Answer: A

Rationale: When a patient experiences alopecia due to chemotherapy, it can significantly impact their self-esteem and body image, particularly in adolescents who are especially sensitive to physical changes. A request for makeup and a wig indicates that the patient is actively taking steps to enhance her appearance and cope with the changes brought on by her treatment. This action reflects a positive engagement with her body image and suggests a desire to feel more comfortable and confident in her appearance, signaling an improvement in her self-esteem.

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: C

Rationale: Hydroxyurea is effective in lowering the platelet count for patients with ET.

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: B

Rationale: Risk for infection is a high priority due to the patient's compromised immune system from AML.