TASK DEFINITION: Generate a correct and concise answer for the question based on the words in the context.
PROBLEM: Context : Charlie Brooker's Screenwipe is a British television review programme created and presented by Charlie Brooker and broadcast on BBC Four. 
Question : What channel aired Charlie Brooker's Screenwipe?

SOLUTION: BBC Four

PROBLEM: Context : In November 1525, king Gustav I stated that Christina Gyllenstierna was to marry his cousin Johan Turesson, Lord of Falun, riksråd and governor of Nyköping. 
Question : What is Christina Gyllenstierna's spouse's name?

SOLUTION: Johan Turesson

PROBLEM: Context : Stephen Nissenbaum (A.B. Harvard College, 1961; M.A. Columbia University, 1963; Ph.D., University of Wisconsin--Madison, 1968 ), is Professor Emeritus of the History Department, University of Massachusetts at Amherst, specializing in early American history through to the nineteenth century. 
Question : Where did Stephen Nissenbaum study or work?

SOLUTION:
Columbia University