Correct Answer: B

Rationale: The correct answer is B: Immunologic theory. This theory of aging focuses on the decline in immune function as individuals age, making them more vulnerable to infections like the flu. The flu prevention workshop at the senior center aligns with this theory by aiming to boost seniors' immune systems to reduce their susceptibility to the flu. A: Free radical theory attributes aging to the accumulation of damage caused by reactive oxygen species, not specifically related to immune function. C: Oxidative stress theory is similar to the free radical theory in emphasizing the role of oxidative damage in aging, not directly related to immune function. D: Telomere theory suggests that cellular aging is influenced by the shortening of telomeres, which is not directly related to immune function or flu prevention.

Correct Answer: A

Rationale: The correct answer is A because clients with hearing loss typically have difficulty hearing high-pitched tones, making it easier for them to respond to low-pitched tones. Low-pitched tones are easier for individuals with hearing loss to perceive due to the nature of hearing loss affecting the ability to hear higher frequencies. Choice B is incorrect as it is a generalization that does not consider the specific nature of hearing loss. Choice C is incorrect because individuals with hearing loss may require various forms of assistance beyond just lip-reading. Choice D is incorrect as individuals with hearing loss generally struggle more with high-pitched tones.

Correct Answer: B

Rationale: The correct answer is B because limited physical activity and poor nutrition have been consistently linked to cognitive decline in older adults. Physical activity promotes blood flow to the brain, which helps with cognitive function. Additionally, a balanced diet rich in nutrients supports brain health. Genetic predisposition (A) can play a role but is not the most closely associated factor. Social engagement and mental stimulation (C) are beneficial for cognitive health but not the primary factor for decline. Early retirement and lack of work-related stress (D) are not directly linked to cognitive decline.

Correct Answer: C

Rationale: The correct answer is C: Loss of a spouse or close family member. This is the most significant predictor of social isolation in older adults because losing a spouse or close family member can result in decreased social interactions and emotional support. This loss can lead to feelings of loneliness and isolation. Incorrect options: A: Lack of access to healthcare - While lack of access to healthcare can impact overall health, it is not the primary factor contributing to social isolation. B: Limited income and resources - Financial constraints can affect social activities, but they are not as impactful as losing a loved one. D: High levels of physical activity - While physical activity is important for overall well-being, it is not directly correlated with social isolation in older adults.

Correct Answer: B

Rationale: The correct answer is B: Thyroid gland. The thyroid gland produces hormones that regulate metabolism. In older adults, decreased thyroid function, known as hypothyroidism, can lead to a decrease in metabolism. This can result in symptoms such as fatigue, weight gain, and slowed heart rate. A: Kidney - While the kidneys play a role in filtering waste and maintaining fluid balance, decreased kidney function typically does not directly impact metabolism. C: Brain - The brain plays a crucial role in regulating various bodily functions, but it does not directly control metabolism. D: Skeleton - The skeleton provides structural support and protects organs but does not directly influence metabolism.