Correct Answer: D

Rationale: The correct answer is to dispose of the antineoplastic wastes in the hazardous waste receptacle. Antineoplastic agents are hazardous materials, and proper disposal is crucial to prevent harm to individuals and the environment. Option A is incorrect because adjusting the dose based on the patient's present symptoms may not be safe without proper authorization. Option B is incorrect as hand hygiene should be performed both before and after administering medications. Option C is incorrect as gloves and a lab coat should be worn primarily during handling and administration, not just during preparation.

Correct Answer: B

Rationale: The correct advice for a patient with polycythemia vera is to drink plenty of fluids. This helps in reducing the risk of thrombosis by keeping the blood less viscous. Avoiding hot showers (Choice A) is not directly related to managing polycythemia vera. While avoiding tight and restrictive clothing (Choice C) can help improve circulation, it is not the most crucial advice for these patients. Avoiding prolonged sitting (Choice D) is important to prevent blood clots but is not as critical as staying well-hydrated.

Correct Answer: A

Rationale: The correct answer is A: Administer an antiemetic. Chemotherapy commonly causes nausea and vomiting as adverse effects. Antiemetics are medications specifically used to prevent or treat these symptoms. Choices B, C, and D are incorrect because administering an antimetabolite, a tumor antibiotic, or an anticoagulant would not directly address the most common adverse effects of chemotherapy, which are nausea and vomiting.

Correct Answer: C

Rationale: The correct answer is C. A BUN level of 18 mg/dL is within the normal range; however, since cisplatin is nephrotoxic, it requires close monitoring. Elevated BUN levels can indicate impaired kidney function. Choices A, B, and D are within normal ranges and do not directly relate to cisplatin therapy or require immediate intervention.

Correct Answer: A

Rationale: The correct answer is A: Age younger than 50 years. Colorectal cancer is more commonly diagnosed in individuals over the age of 50, so being younger than 50 is not typically considered a significant risk factor. Choice B, history of colorectal polyps, is a known risk factor as polyps can develop into cancer over time. Choice C, family history of colorectal cancer, is a well-established risk factor due to genetic predisposition. Choice D, chronic inflammatory bowel disease, such as Crohn's disease or ulcerative colitis, increases the risk of developing colorectal cancer. Therefore, the incorrect choice is A as age younger than 50 years is not a common risk factor for colorectal cancer.