Correct Answer: A

Rationale: Acanthosis nigricans is a skin condition characterized by multiple, hyperpigmented, velvety plaques typically seen in flexural areas such as the axillae, neck, and groin. These lesions are often associated with obesity and insulin resistance. The appearance of acanthosis nigricans is distinct from other skin conditions such as seborrheic keratosis, dermatofibroma, and epidermal nevus. Acanthosis nigricans is commonly seen in conditions like obesity, type 2 diabetes, and metabolic syndrome due to the insulin resistance that leads to the overgrowth of keratinocytes.

Correct Answer: A

Rationale: Polycystic ovary syndrome (PCOS) is a common endocrine disorder in women of reproductive age. It is characterized by the presence of multiple fluid-filled sacs (cysts) within the ovaries, which can be visualized on ultrasound. Women with PCOS often experience menstrual irregularities such as irregular periods or no periods, as well as symptoms of hyperandrogenism like hirsutism (excessive hair growth) and acne. Other common features of PCOS include insulin resistance and obesity. It is important to note that not all women with PCOS will have ovarian cysts, but the presence of multiple cysts is a common finding in this condition.

Correct Answer: D

Rationale: Alzheimer's disease is the most common form of dementia. Dementia is a general term for a decline in mental ability that becomes severe enough to interfere with daily life. It can affect memory, thinking skills, and the ability to perform everyday tasks. Alzheimer's disease specifically is a progressive brain disorder that slowly destroys memory and thinking skills and eventually impairs the ability to carry out simple tasks. Therefore, the provided condition of having difficulty in processing stimuli and new information aligns with the symptoms commonly seen in individuals with Alzheimer's disease.

Correct Answer: B

Rationale: In a patient experiencing an acute asthma exacerbation with severe respiratory distress and hypoxemia, the most appropriate intervention is to initiate non-invasive positive pressure ventilation (NIPPV). NIPPV can help improve ventilation, decrease work of breathing, and correct hypoxemia by providing positive pressure to keep the airways open, reduce air trapping, and increase the elimination of carbon dioxide. This intervention can help improve oxygenation and reduce the need for invasive mechanical ventilation in patients with severe asthma exacerbations. Administering high-flow oxygen via nasal cannula alone may not provide enough support for patients with severe respiratory distress. Nebulized albuterol/ipratropium combination therapy and intravenous corticosteroid therapy are also important treatments for asthma exacerbations but are not the first-line interventions for patients with severe respiratory distress and hypoxemia.

Correct Answer: D

Rationale: The symptoms described by the patient indicate a potential transfusion reaction, such as a hemolytic reaction or allergic reaction. The immediate action the nurse should take in such a situation is to stop the infusion of the packed red blood cells. This will help prevent further complications and ensure the safety of the patient. After stopping the infusion, the nurse should assess the patient's condition, monitor vital signs, and inform the healthcare team, including the physician, regarding the situation. Once the patient is stable, further investigations can be conducted to determine the cause of the reaction.