Correct Answer: C

Rationale: The first action the nurse should take when a patient post-thyroidectomy develops signs of hypocalcemia is to assess the patient's calcium level. By assessing the patient's calcium level through laboratory testing, the nurse can confirm the presence of hypocalcemia and determine the severity of the condition. This information will guide further interventions, such as administering calcium supplements or notifying the healthcare provider for additional management. It is important to confirm the diagnosis before proceeding with treatment to ensure appropriate and safe care for the patient.

Correct Answer: C

Rationale: Placenta previa is a condition in pregnancy where the placenta implants low in the uterus, partially or completely covering the cervix. This can lead to painless, bright red vaginal bleeding in the third trimester. However, in some cases, placenta previa can also present with sudden onset of severe lower abdominal pain and signs of shock, such as syncope, pallor, and abdominal distention due to concealed bleeding. In severe cases, the bleeding can be significant and life-threatening for both the mother and the baby. It is important to promptly diagnose and manage placenta previa to prevent complications.

Correct Answer: D

Rationale: In a 55-year-old postmenopausal woman presenting with vaginal bleeding and a healthy cervix on examination, the most likely cause would be a cervical polyp. Cervical polyps are benign growths that can occur on the cervix and are often asymptomatic but can occasionally cause postmenopausal bleeding. Their appearance on examination would typically be a non-malignant finding with no cervical motion tenderness. Cervical cancer, endometrial cancer, and vaginal cancer would typically present with different examination findings and risk factors.

Correct Answer: A

Rationale: Immunity that the baby gets from the immune mother through breastfeeding is considered passive natural immunity. This is because the baby receives pre-formed antibodies from the mother's breast milk, providing temporary protection until the baby's own immune system is fully developed. This type of immunity is passive since the baby does not produce its antibodies, and it is considered natural because it happens through a natural process of breastfeeding.

Correct Answer: D

Rationale: Knowing the prevalence of diseases provides information on the magnitude of health problems within a community. Prevalence refers to the proportion of individuals in a population who have a particular disease or condition at a specific point in time. By understanding the prevalence rates of different diseases, healthcare providers can better assess the extent of health issues affecting the community. This information is crucial for prioritizing resources and interventions to address the most pressing health concerns effectively. Additionally, prevalence data can guide public health efforts in developing targeted prevention strategies and allocating resources appropriately to improve community health outcomes.