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.

[EX Q]: Context: Charles Wilson Cross died of a heart attack June 2, 1928, in Calgary. 
 Question: What was Charles Wilson Cross's cause of death?
[EX A]: heart attack

[EX Q]: Context: The Gruffalo is a children's book by writer and playwright Julia Donaldson, illustrated by Axel Scheffler, that tells the story of a mouse, the protagonist of the book, taking a walk in a European forest. 
 Question: What person illustrated The Gruffalo?
[EX A]: axel scheffler

[EX Q]: Context: SMARCAL1 (SWI/SNF Related, Matrix Associated, Actin Dependent Regulator Of Chromatin, Subfamily A-Like 1), also known as HARP, is an ATP-dependent annealing helicase that stabilizes replication forks during DNA damage. Mutations in this gene are the cause of Schimke immune-osseous dysplasia (SIOD), an autosomal recessive disorder characterized by T-cell immunodeficiency and growth dysfunctions. In this review, we summarize the main roles of SMARCAL1 in DNA repair, telomere maintenance and replication fork stability in response to DNA replication stress. 
 Question: Mutations in which gene cause Schimke immune-osseous dysplasia?
[EX A]:
harp