Correct Answer: B

Rationale: T cell exhaustion is a state of T cell dysfunction that arises during chronic viral infections or cancer. In the case of a chronic viral infection, the persistent exposure to viral antigens leads to continuous stimulation of CD8+ cytotoxic T cells. Over time, this sustained stimulation can lead to T cell exhaustion, characterized by the upregulation of inhibitory receptors, impaired effector functions, and reduced proliferative capacity. As a result, despite the elevated levels of CD8+ T cells in the blood, their function may be compromised, ultimately impacting the immune response against the viral infection. In contrast, activation-induced cell death (AICD) may contribute to T cell loss during chronic infections but would not explain the persistently elevated CD8+ T cell levels. Thymic involution refers to the age-related decline in thymus function, which is not directly related to the observed increase in CD8+ T cells. Antigenic

Correct Answer: B

Rationale: The presentation described is consistent with nummular eczema, also known as discoid eczema. Nummular eczema typically presents as circular or oval-shaped patches of eczematous rash with fine scaling and central clearing. It is often pruritic and can be triggered by exposure to irritants such as new soaps or laundry detergents. The distribution on the trunk and proximal extremities is also typical for nummular eczema. Tinea corporis (ringworm) would present with a more raised, scaly, and well-defined border with central clearing. Pityriasis rosea presents with a herald patch followed by smaller oval or round lesions in a "Christmas tree" distribution. Lichen planus would present with polygonal, purplish, flat-topped papules typically located on flexural surfaces and extremities.

Correct Answer: C

Rationale: The correct next step after positioning the child is to drop the medicine into the ear canal. This is typically the next step in administering ear drops for a child. The cleaning and positioning steps are to prepare the ear for receiving the medication. Dropping the medicine into the ear canal ensures that the medication can reach the affected area effectively. Once the medicine is dropped into the ear canal, it is important to follow any additional instructions provided by the healthcare provider regarding keeping the ear in a certain position or any other post-administration care steps.

Correct Answer: B

Rationale: Health education is a crucial component of public health aimed at promoting health, preventing diseases, and empowering individuals to make informed decisions about their health. It is not limited to only professionals like nurses but is the responsibility of every health worker across various disciplines. Health workers, including doctors, community health workers, public health educators, and others, play a vital role in delivering health education to the community they serve. By ensuring that health education is a shared responsibility among all health workers, a more comprehensive and effective approach to public health promotion can be achieved. It is continuously evolving to adapt to changing health needs and challenges, making it dynamic rather than remaining constant. Therefore, option B is the most accurate statement regarding health education in public health.

Correct Answer: D

Rationale: Acute respiratory distress syndrome (ARDS) is a severe condition characterized by widespread inflammation in the lungs leading to increased pulmonary vascular permeability, non-cardiogenic pulmonary edema, and respiratory failure. In ARDS, the alveolar-capillary barrier is disrupted, resulting in fluid accumulation in the alveoli and impaired gas exchange.