Correct Answer: C

Rationale: The presence of spindle-shaped cells and psammoma bodies on fine-needle aspiration biopsy is characteristic of follicular thyroid carcinoma. This type of thyroid cancer can present as a thyroid nodule associated with signs of hyperthyroidism due to the release of thyroid hormones from the cancerous thyroid cells. Hashimoto's thyroiditis is an autoimmune condition that typically presents with hypothyroidism, while Graves' disease is another autoimmune disorder that results in hyperthyroidism but is not associated with the presence of spindle-shaped cells and psammoma bodies in this context. Papillary thyroid carcinoma may also present with thyroid nodules, but it is more commonly associated with papillary structures and nuclear features rather than spindle-shaped cells seen in follicular thyroid carcinoma.

Correct Answer: C

Rationale: Cryptosporidium parvum is a protozoan parasite that commonly causes waterborne illness characterized by watery diarrhea, abdominal cramps, and nausea. This parasite is often transmitted through contaminated water sources such as streams or lakes. Laboratory tests identifying oocysts in the stool sample are indicative of Cryptosporidium infection. Giardia lamblia can also cause similar symptoms, but the presence of oocysts points more towards Cryptosporidium in this case. Entamoeba histolytica causes amoebic dysentery with bloody diarrhea and is usually associated with fecal-oral transmission through contaminated food or water. Cyclospora cayetanensis typically causes prolonged watery diarrhea and is associated with the ingestion of contaminated food or water.

Correct Answer: A

Rationale: A retrospective audit involves reviewing past cases or data to evaluate processes, outcomes, or compliance with standards. In this scenario, the nursing team plans to audit post-op patients who developed pressure sores over the past year at the Orthopedic unit. By looking at historical data from the past year, the audit is considered retrospective as it assesses what has occurred over a specified period. This type of audit helps identify trends, patterns, and areas for improvement based on past events.

Correct Answer: C

Rationale: The APCAR (Appearance, Pulse, Grimace, Activity, Respiration) score is used to evaluate a newborn's condition in the first few minutes after birth. This assessment typically occurs within the first 1 to 3 minutes after the baby is born. The score helps healthcare providers quickly assess the baby's overall well-being and determine if any immediate interventions or further monitoring are necessary.

Correct Answer: D

Rationale: The causative agent of dengue fever is a virus. Dengue fever is primarily transmitted to humans by the bite of infected Aedes mosquitoes, particularly Aedes aegypti and Aedes albopictus. These mosquitoes act as vectors, carrying and transmitting the dengue virus (specifically four closely related but antigenically different serotypes: DEN-1, DEN-2, DEN-3, and DEN-4) to humans during the feeding process. The virus then replicates in the human body, causing symptoms of dengue fever. Therefore, the correct answer is D. Virus.