Generate a correct and concise answer for the question based on the words in the context.

Context : The Eighth Doctor Adventures (sometimes abbreviated as EDA or referred to as the EDAs) are a series of spin off novels based on the long running BBC science fiction television series Doctor Who and published under the BBC Books imprint. 
Question : The Eighth Doctor Adventures is based upon what?
Doctor Who

Context : Alfred Verhulst was a Brigadier General in the United States Air Force. 
Question : Which armed forces did Alfred Verhulst serve?
United States Air Force

Context : A longtime alcoholic, Orry-Kelly died of liver cancer in Hollywood and was interred in the Forest Lawn Memorial Park, Hollywood Hills. 
Question : Which ailment caused the death of Orry-Kelly?

liver cancer