Which of the following symptoms is associated with Parkinson's Disease?

The development of a tremor is a hallmark symptom of Parkinson's Disease. This condition primarily affects movement control due to the progressive degeneration of the neurons that produce dopamine, a neurotransmitter that plays a key role in coordinating smooth and controlled muscle movements. The tremors often begin in one hand and can manifest as a resting tremor, meaning they occur when the muscle is relaxed and can subside with purposeful movement.

In contrast, the other symptoms listed do not have a direct association with Parkinson's. Sensitivity to light may occur in various conditions, but it is not a primary symptom of Parkinson's. While some individuals with Parkinson's may experience cognitive changes, memory loss is not one of the defining characteristics of the disease; rather, it is more typically associated with conditions like Alzheimer's disease. Weight gain is also not commonly linked to Parkinson's, as many individuals may experience weight loss due to reduced mobility and changes in appetite. Hence, the development of a tremor stands out as the key symptom associated with Parkinson's Disease.