What is one characteristic of frailty?

C is the correct choice because frailty is a clinical syndrome characterized by decreased physiological reserve and increased vulnerability to stressors. One hallmark of frailty is poor endurance, which often leads to feelings of exhaustion, especially during physical activities or everyday tasks. Individuals who are frail may not have the stamina to engage in activities that they used to perform easily, making the identification of poor endurance an important factor in recognizing frailty.

In contrast, high energy levels and strength training abilities are generally associated with fitness and robustness, which run counter to the concept of frailty. Unintentional weight gain may suggest other health issues, but it does not directly reflect the diminished energy and endurance reflective of a frail state. Therefore, recognizing poor endurance and exhaustion is critical when assessing patients for frailty.