Definition: Generate a correct and concise answer for the question based on the words in the context.
Input: Context : He shortly worked in a school in Glarisegg (TG,CH) and later founded an experimental school ('La Forge') in Lausanne, Switzerland, but Adolphe Ferrière had to quickly abandon teaching due to his deafness. 
Question : What disease did Adolphe Ferrière contract?
Output:
deafness