Question: Cumbrians Opposed to a Radioactive Environment has campaigned against all aspects of the operation of Sellafield, formally known as which worst nuclear accident in Great Britain's history, ranked in severity at level 5 out of a possible 7 on the International Nuclear Event Scale?
{'answer': 'Windscale', 'supporting_facts': [['Cumbrians Opposed to a Radioactive Environment', 0], ['Windscale fire', 0]]}