What is the most common type of dementia in older adults?

Correct Answer: A

Rationale: The correct answer is A: Alzheimer's disease. It is the most common type of dementia in older adults, accounting for around 60-80% of cases. Alzheimer's is characterized by the presence of beta-amyloid plaques and tau protein tangles in the brain, leading to memory loss and cognitive decline. Vascular dementia (B) is caused by impaired blood flow to the brain, Lewy body dementia (C) is characterized by abnormal protein deposits in the brain, and Frontotemporal dementia (D) affects the frontal and temporal lobes of the brain, leading to changes in behavior and personality. However, in older adults, Alzheimer's disease is the most prevalent form of dementia due to its widespread impact on memory and cognition.

Correct Answer: C

Rationale: The correct answer is C because older adults often experience adverse drug reactions due to their slower renal and hepatic function. This leads to a decreased ability to clear drugs from the body efficiently, increasing the risk of drug accumulation and toxicity. Choice A is incorrect because aging typically results in slower drug metabolism, not faster. Choice B is also incorrect as older adults tend to take more medications, increasing the likelihood of drug interactions and adverse reactions. Choice D is incorrect because aging is associated with a decline in immune function, making older adults more susceptible to adverse drug reactions.

Correct Answer: B

Rationale: The correct answer is B: Dementia. Older adults often experience cognitive decline, memory loss, and behavioral changes that can be mistaken for symptoms of depression. Dementia is a common condition in the elderly that can be misdiagnosed due to overlapping symptoms such as apathy, social withdrawal, and changes in sleep patterns. Chronic fatigue syndrome (A), anemia (C), and sleep apnea (D) may also present with symptoms of fatigue and sleep disturbances, but they are less likely to be confused with depression in older adults compared to dementia.

Correct Answer: C

Rationale: The correct answer is C: Yoga and tai chi. These exercises focus on balance, flexibility, and strength, which are crucial for preventing falls in older adults. Yoga and tai chi also promote mindfulness and body awareness, further enhancing balance and coordination. Swimming (choice A) is beneficial for overall fitness but may not specifically target balance and fall prevention. Weight training (choice B) is important for muscle strength but may not address balance and flexibility adequately. Running (choice D) is high-impact and may actually increase the risk of falls for older adults.

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.