Which statement about Parkinson disease prognosis is correct?

• A. Cure is expected within a year
• B. Prognosis is 5-20 years
• C. Prognosis is always longer than 40 years
• D. There is no variability in disease progression

Answer: (B)

Parkinson disease prognosis is variable and there is no cure. Because progression differs widely between individuals, the typical disease duration after onset is best described as a range rather than a fixed time. The statement that matches this variability is that prognosis is about 5–20 years after onset. This acknowledges that some people live shorter periods and others longer, depending on factors like age at onset, overall health, and response to therapy.

The other ideas aren’t accurate: there is no cure to expect within a year, and not everyone lives longer than 40 years after onset. Moreover, progression is not the same for every person—there is meaningful variability in how the disease advances and how long someone can live with it.