TASK DEFINITION: Generate a correct and concise answer for the question based on the words in the context.
PROBLEM: Context : Robert Ledley died of Alzheimer's disease in Kensington, Maryland, USA on July 24, 2012. 
Question : Which medical condition does Robert Ledley suffer from?

SOLUTION: Alzheimer's disease

PROBLEM: Context : Lodela draws its inspiration from the Bardo Thodol, with the film's title a corruption of ``l'au-delà,'' a French term for the hereafter. 
Question : The Lodela is based upon what?

SOLUTION: Bardo Thodol

PROBLEM: Context : Elementary OS (styled ``elementary OS'') is a Linux distribution based on Ubuntu. 
Question : The Elementary OS is based upon what?

SOLUTION:
Ubuntu