Correct Answer: B

Rationale: The correct answer is B: 45-year old woman who has never been pregnant. This client has the highest risk of ovarian cancer due to nulliparity, which is a known risk factor. Women who have never been pregnant have a higher risk of developing ovarian cancer compared to those who have had children. Other choices are incorrect because contraceptives actually reduce the risk of ovarian cancer, having children can slightly decrease the risk, and having a child at a young age does not increase the risk significantly.

Correct Answer: A

Rationale: The correct answer is A: Decreased gastrointestinal motility. This is the defining characteristic because it directly links the cause (pain medication administration) to the effect (constipation). The patient's lack of bowel movement, abdominal distention, and pain are all consequences of decreased gastrointestinal motility. Pain medication slows down the movement of the intestines, leading to constipation. Choices B, C, and D are incorrect because while they are related to the patient's condition, they are not the defining characteristic that connects the cause to the effect in this specific scenario.

Correct Answer: A

Rationale: The correct answer is A: 2 L/min. In emphysema, there is impaired gas exchange due to damaged lung tissue, resulting in decreased oxygen levels. Administering too high a flow rate can lead to oxygen toxicity. The standard oxygen therapy for emphysema is 1-2 L/min to maintain oxygen saturation without causing harm. Higher flow rates like 10 L/min (B) and 6 L/min (C) are excessive and can lead to oxygen toxicity. 95 L/min (D) is dangerously high and not suitable for oxygen therapy in emphysema. Therefore, A is the correct choice for safe and effective oxygen administration in emphysema.

Correct Answer: A

Rationale: The correct answer is A: Antihistamines. Labyrinthitis is an inner ear condition often caused by inflammation or infection. Antihistamines help reduce symptoms like vertigo and dizziness by decreasing inflammation and fluid buildup in the inner ear. Anti-inflammatories (choice B) may help with inflammation but are not as effective for inner ear conditions. Antispasmotics (choice C) are not typically used for treating labyrinthitis. Antiemetics (choice D) are used to control nausea and vomiting, which can be symptoms of labyrinthitis but do not address the underlying cause.

Correct Answer: B

Rationale: The correct answer is B: "Keep the stoma dry." Keeping the stoma dry helps prevent infection and skin irritation. Moisture can lead to fungal growth and skin breakdown. Option A is incorrect because keeping the stoma uncovered can increase the risk of contamination and infection. Option C is incorrect as self-care promotes independence and allows the client to become familiar with the procedure. Option D is incorrect as moisture can lead to skin issues.