Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Q: Context : Fred Kaan died in Penrith on 4 October 2009, having suffered from Alzheimer's disease and cancer in his last years. 
Question : What illness did Fred Kaan suffer from?
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Alzheimer's disease