Correct Answer: B

Rationale: The Epidemiologic Triad model focuses on identifying the causative factors of diseases, particularly infectious diseases. The three components of the triad are the external agent, the susceptible host, and the environment. These factors interact to result in the occurrence of disease. Treatment Regimen, on the other hand, is not one of the causative factors but rather a response to manage and treat the disease once it has occurred. While treatment is essential, it is not part of the factors that contribute to the initial development of the disease within the Epidemiologic Triad model.

Correct Answer: A

Rationale: The appropriate action for a nurse in this situation is to request the senior nurse to read the illegible order for clarification. It is essential to ensure accurate and safe patient care by confirming the correct interpretation of the order with a colleague familiar with the handwriting. This action helps prevent errors and misunderstandings that may occur due to illegible handwriting. Consulting with the senior nurse is a common practice in healthcare settings to maintain effective communication and avoid mistakes in patient care.

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: B

Rationale: Radiologic procedures are typically not used as the least screening assessment by nurses in a perinatal unit. The nurse's initial screening assessments usually focus on gathering information through techniques such as physical examination, interviews, and reviewing laboratory results. Radiologic procedures, such as X-rays or CT scans, are usually ordered by physicians once a more specific diagnostic need has been identified, based on the initial screening assessments performed by the nurse. Therefore, in this scenario, the least screening assessment to be used by the nurse would be radiologic procedures.

Correct Answer: D

Rationale: Papillary thyroid carcinoma is the most common type of thyroid cancer and is known for presenting as a painless unilateral enlargement of the thyroid gland. Fine-needle aspiration cytology typically reveals classic features such as numerous microfollicles and psammoma bodies. Thyroglossal duct cyst, Hashimoto's thyroiditis, and thyroid adenoma would not typically present with these cytological features or with painless thyroid enlargement as seen in papillary thyroid carcinoma.