Correct Answer: B

Rationale: The correct answer is B because a fixed nodular mass with dimpling of the overlying skin is a classic sign of breast cancer. This finding is concerning as it indicates an abnormal growth that has invaded surrounding tissues. Dimpling occurs due to fibrotic changes pulling on the skin. Choices A, C, and D are incorrect. A slight asymmetry of the breasts is common and not necessarily indicative of cancer. Bloody discharge from the nipple can be a sign of other conditions like intraductal papilloma. Multiple firm, round, freely movable masses that change with the menstrual cycle are likely benign fibrocystic changes.

Correct Answer: D

Rationale: The correct answer is D: Subclavian veins. Lymph returns to the blood through the subclavian veins because they receive lymphatic drainage from the thoracic duct and right lymphatic duct. Lymphatic vessels merge into lymphatic ducts, which empty into the subclavian veins, allowing lymph to re-enter the bloodstream. The carotid arteries (A) carry oxygen-rich blood to the brain, the aorta (C) is the main artery of the body carrying oxygenated blood from the heart, and the inferior vena cava (B) returns deoxygenated blood from the lower body to the heart. Therefore, choices A, B, and C are incorrect as they are not involved in the return of lymph to the blood.

Correct Answer: C

Rationale: The correct answer is C: bacteria. Hepatitis is primarily caused by viruses (such as Hepatitis A, B, C), toxins (like alcohol or certain medications), and chemicals/drugs. Bacteria do not typically cause hepatitis as it is a viral infection that affects the liver. Therefore, choice C is the exception among the listed causes. Viruses directly target liver cells, toxins can damage the liver, and certain chemicals/drugs can lead to liver inflammation. Hence, bacteria do not play a significant role in causing hepatitis.

Correct Answer: D

Rationale: The correct answer is D. Carbogen is a gas mixture of carbon dioxide and oxygen. Inhaling carbogen can stimulate respiration due to increased oxygen levels and carbon dioxide acting as a respiratory stimulant. It can also dilate blood vessels, enhancing oxygen delivery to tissues. Additionally, carbogen can help dislodge blood clots by improving blood flow and oxygenation. Therefore, all the choices (A, B, and C) are correct as inhaling carbogen can have multiple beneficial effects on respiration, blood vessels, and blood clot dislodging.

Correct Answer: B

Rationale: The correct answer is B: Drowsiness. Muscle relaxants can cause drowsiness as a common side effect due to their sedative properties. This can impair alertness and coordination, so it's crucial for the patient to be aware of this potential effect. Choice A, hypoglycemia, is not typically associated with muscle relaxants. Choice C, hypotension, is more commonly linked to medications like antihypertensives. Choice D, dyspnea, which is difficulty breathing, is not a common side effect of muscle relaxants. Therefore, the nurse should primarily focus on educating the patient about the potential side effect of drowsiness.