Which of the following statements about Parkinson's disease is true?

Parkinson's disease is a progressive neurological disorder that primarily affects movement, and while there is ongoing research into various treatments, including those involving stem cells, the assertion that it can be treated by stem cells is supported by current scientific inquiry. Stem cell therapy has been explored as a potential avenue for repairing or replacing the damaged neurons found in individuals with Parkinson's disease. This research suggests that stem cells could help restore some of the lost function, but it is important to note that while there is promise in this area, stem cell treatment for Parkinson's is still largely experimental and not yet a standard treatment.

The other statements do not accurately reflect the complexities of Parkinson's disease. It is not solely an illness that affects the elderly, as it can occur in younger individuals, although the majority of cases are diagnosed later in life. Additionally, Parkinson’s disease has both genetic and environmental factors involved in its etiology, and it's not accurate to attribute it exclusively to environmental causes. Lastly, while treatments exist to manage symptoms, there is currently no complete cure for Parkinson's disease, making the idea of it being fully curable misleading. Thus, the statement regarding stem cell treatment aligns with current research efforts, underscoring the evolving landscape of Parkinson's disease treatment and potential