Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Example Input: Context: Kanalaattam is a 1979 Indian Malayalam film, directed by C Radhakrishnan and produced by PMK Bapu. 
 Question: In what year is the film Kanalaattam released?
Example Output: 1979

Example Input: Context: At Peikapw, a place of prayer, Isokelekel saw his reflection in a pool of water and, realizing his old age, decided to commit suicide. 
 Question: Was the death of Isokelekel an accident or suicide?
Example Output: suicide

Example Input: Context: Machado-Joseph disease (MJD), also called spinocerebellar ataxia type 3, is caused by mutant ataxin-3 with a polyglutamine expansion. Although there is no treatment available at present to cure or delay the onset of MJD, mouse models have been generated to facilitate the development of a therapy. In this review, the published reports on mouse models of MJD and other polyglutamine spinocerebellar ataxias are compared. Based on these studies, the following approaches will be discussed as candidate treatments for MJD: 1) interfering with the formation of the mutant ataxin-3 cleavage fragment and possibly aggregate or inclusions, 2) reducing the disease protein nuclear localization, and 3) decreasing mutant ataxin-3 expression in neurons. 
 Question: Which is the protein implicated in Spinocerebellar ataxia type 3?
Example Output:
ataxin-3