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

[EX Q]: Context : OPML (Outline Processor Markup Language) is an XML format for outlines (defined as ``a tree, where each node contains a set of named attributes with string values''). 
Question : Which is the basis of OPML?
[EX A]: XML

[EX Q]: Context : ``A Good Man Goes to War'' is the seventh episode of the sixth series of the British science fiction television series Doctor Who, and was first broadcast on BBC One on 4 June 2011 and served as a mid-series finale. 
Question : The A Good Man Goes to War was in what series?
[EX A]: Doctor Who

[EX Q]: Context : Charles Lipson (born February 1, 1948) is an American professor of political science at the University of Chicago. 
Question : What is Charles Lipson's place of employment?
[EX A]:
University of Chicago