Task: Question Generation
Input (English): Context : In November 2012, International Airlines Group, whose subsidiary Iberia held a 45.85% stake in Vueling, offered to buy the remaining 54.15% of the company with both Iberia and IAG owning both shares and not resulting in the company being wholly owned by IAG through 100% of shares. 
Answer : International Airlines Group
Output (English): Which company is the parent company of Vueling?