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

[EX Q]: Context : ''Intro to Knots'' is the tenth episode of the fourth season of the NBC sitcom Community, which originally aired on April 18, 2013.
Question : Which series is Intro to Knots apart of?
[EX A]: Community

[EX Q]: Context : Tuor remained in Gondolin, and wed Turgon's daughter, Idril Celebrindal.
Question : What is Tuor's spouse's name?
[EX A]: Idril

[EX Q]: Context : Keolis Downer is a joint venture between Keolis, the largest private sector French transport group, and Downer Rail, an Australian railway engineering company, that operates bus and tram services in Australia.
Question : Which company is the parent company of Keolis Downer?
[EX A]:
Downer Rail