Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Example Input: The 1980 film Magnificent 72 and the 2011 film 72 Heroes focus on the uprising. Events of the uprising open the 2011 film 1911.
Example Output: Which film cam out first, in 1980 Magnificent 72 or 2011 72 Heroes?

Example Input: HD 114837 is a star in the constellation Centaurus.
Example Output: The star HD 114837 is part of the constellation known as what?

Example Input: McLeod syndrome and chorea-acanthocytosis are classified with the so-called neuroacanthocytosis group of syndromes. Both lead to progressive basal ganglia degeneration and were not easily distinguished in the past. With the discovery of their molecular bases, mutations of the X-linked gene XK and autosomal recessive mutations of the gene coding for chorein, respectively, the two phenotypes can now be differentiated and extend the diagnostic spectrum in patients presenting with chorea. The present review compares the two conditions and proposes a practical approach to diagnosis and treatment. Better-defined disease concepts should eventually replace the umbrella term of "neuroacanthocytosis." Animal models are needed to understand the underlying mechanisms. A final common pathway is likely for the pathogenesis of these conditions and is most probably shared with Huntington's disease.
Example Output:
Mutation of which gene is associated with McLeod syndrome?