Task: Question Generation
Input (English): Context : The Miraflores Altarpiece (or Triptych of the Virgin, or The Altar of Our Lady or the Mary Altarpiece) is a c. 1442-5 oil-on-oak wood panel altarpiece by the Early Netherlandish painter Rogier van der Weyden, in the Gemäldegalerie, Berlin since 1850. 
Subject : Miraflores Altarpiece 
Relation : collection
Output (English): What is the name of the place where Miraflores Altarpiece can be found?