Question: What is the name of the actor who played the role of the person who is Keeper of Keys and Grounds of Hogwarts in "Harry Potter" films?
{'answer': 'Robbie Coltrane', 'supporting_facts': [['Robbie Coltrane', 0], ['Robbie Coltrane', 1], ['Rubeus Hagrid', 0], ['Rubeus Hagrid', 1]]}