Task: Question Generation
Input (English): Context : Vueling Airlines, S.A. (styled as Vueling, Spanish pronunciation: (ˈbwelin); BMAD: VLG) is a Spanish low-cost airline based at El Prat de Llobregat in Greater Barcelona with hubs in Barcelona-- El Prat Airport and Leonardo da Vinci-- 
Subject : Vueling 
Relation : parent company
Output (English): Which company is the parent company of Vueling?