Question: Which river in the English county of Warwickshire has a ferry named after the main antagonist from the William Shakespeare comedy Twelfth Night?
{'answer': 'River Avon', 'supporting_facts': [['Stratford-upon-Avon chain ferry', 0], ['Stratford-upon-Avon chain ferry', 3], ['Malvolio', 0], ['Malvolio', 1]]}