Correct Answer: C

Rationale: Cryptosporidium parvum is a protozoan parasite often found in contaminated water sources. This parasite is known to cause watery diarrhea, abdominal cramps, and nausea in infected individuals. The presence of oocysts in the stool sample is characteristic of Cryptosporidium infection. Other parasitic infections may present with similar symptoms, but in this case, the most likely culprit based on the exposure history and laboratory findings is Cryptosporidium parvum.

Correct Answer: A

Rationale: X-ray is the most commonly used imaging modality to diagnose fractures of the long bones, such as the femur or tibia. X-rays are readily available, fast, cost-effective, and provide detailed images of the bone structures. Fractures appear as breaks or discontinuities in the bone on X-ray images, making it an excellent tool for diagnosing bone fractures. In many cases, X-rays are sufficient to confirm the presence, location, and type of fracture, allowing for appropriate treatment planning. Other imaging modalities like MRI and CT scans may be used for further evaluation in complex cases, but X-ray remains the initial and primary choice for diagnosing long bone fractures.

Correct Answer: A

Rationale: The primary intervention that should be prioritized for managing a catheter-related bloodstream infection (CRBSI) associated with a central venous catheter is to remove the central venous catheter. CRBSI is a serious complication that can lead to severe infections and sepsis. The removal of the catheter is crucial to eliminate the source of the infection and prevent further dissemination of the pathogens into the bloodstream. Once the catheter is removed, the healthcare team can consider other interventions such as administering targeted antibiotics based on culture results, performing blood cultures to identify the causative organism, and implementing sterile dressing changes and catheter care protocols. However, immediate removal of the catheter takes precedence in managing CRBSI to prevent worsening of the infection and improve patient outcomes.

Correct Answer: B

Rationale: First-voided morning urine is the best urine sample to be used for an accurate result of a pregnancy test done at home because it is more concentrated compared to urine samples collected at other times of the day. Overnight, the hCG hormone (human chorionic gonadotropin) builds up in a woman's body, making the early morning urine more likely to contain higher levels of hCG if a woman is pregnant. The concentrated nature of first-morning urine reduces the chances of false-negative results since it provides a higher concentration of the hormone that the test is designed to detect. Therefore, using first-morning urine increases the sensitivity of the pregnancy test and improves the accuracy of the results.

Correct Answer: B

Rationale: Beta-blockers work by blocking the effects of adrenaline on beta receptors in the body. One common adverse effect of beta-blockers is bradycardia, or a slowed heart rate. Since the patient is being prescribed a beta-blocker for migraine headaches, it is important for the nurse to monitor closely for signs and symptoms of bradycardia such as dizziness, fatigue, and fainting. Monitoring the heart rate regularly and reporting any significant decrease to the healthcare provider is essential to prevent complications associated with bradycardia. Compared to the other options, bradycardia is the most relevant adverse effect to monitor in a patient prescribed a beta-blocker.