Question: In what book is a heffalump a fictional character
{'answer': 'The House at Pooh Corner', 'supporting_facts': [['Heffalump', 0], ['Heffalump', 1], ['Winnie-the-Pooh (book)', 0], ['Winnie-the-Pooh (book)', 1], ['Winnie-the-Pooh (book)', 4]]}