Correct Answer: A

Rationale: The correct answer is A. Secondary MDS can occur at any age and results from prior toxic exposure to chemicals, including chemotherapeutic medications. Asking about exposure to toxic chemicals in previous jobs directly addresses the potential etiology of this patient's health problem. Choices B, C, and D are not as directly related to the etiology of secondary MDS. Recurrent infections (Choice B) are not a known cause of MDS. Family history (Choice C) is more pertinent to primary MDS, which has a genetic component, while sun exposure (Choice D) is not associated with the etiology of MDS.

Correct Answer: C

Rationale: Monitoring hemoglobin and hematocrit is essential to assess the effectiveness of ruxolitinib in treating myelofibrosis. Ruxolitinib works by inhibiting JAK1 and JAK2, which are involved in the signaling pathways that regulate blood cell production. Therefore, monitoring hemoglobin and hematocrit levels can provide valuable information on how well the drug is managing the disease. Blood pressure, white blood cell count, and spleen size are not direct indicators of the treatment's effectiveness in myelofibrosis.

Correct Answer: B

Rationale: The correct answer is B because the skin at the radiation site is sensitive to sunlight, and exposure can cause further damage. It is crucial to protect the area from direct sunlight to prevent skin irritation or burns. Choice A is incorrect as salt water typically does not pose a significant risk to the radiation site. Choice C is a positive and encouraging response but does not provide necessary advice for post-radiation care. Choice D, while important in some cases, is not directly related to the client's beach vacation after completing radiation treatments.

Correct Answer: A

Rationale: The correct answer is A. Secondary MDS can occur at any age and results from prior toxic exposure to chemicals, including chemotherapeutic medications. Asking about exposure to toxic chemicals in previous jobs directly addresses the potential etiology of this patient's health problem. Choices B, C, and D are not as directly related to the etiology of secondary MDS. Recurrent infections (Choice B) are not a known cause of MDS. Family history (Choice C) is more pertinent to primary MDS, which has a genetic component, while sun exposure (Choice D) is not associated with the etiology of MDS.

Correct Answer: C

Rationale: For patients experiencing difficulties with oral intake, the provision of small, easily chewed meals may be beneficial. Option A (TPN) and B (PEG tube placement) are more invasive interventions and should be considered if non-oral routes are necessary. Option D is not appropriate as the primary responsibility for a patient's nutrition should lie with healthcare professionals to ensure proper management and monitoring.