Question: Who canceled the project for the Landkreuzer P. 1000 Ratte, which would have surpassed the Panzer VIII Maus as being the heaviest fully enclosed armoured fighting vehicle ever built?
{'answer': 'Minister of Armaments Albert Speer', 'supporting_facts': [['Landkreuzer P. 1000 Ratte', 0], ['Landkreuzer P. 1000 Ratte', 3], ['Landkreuzer P. 1000 Ratte', 4], ['Panzer VIII Maus', 0], ['Panzer VIII Maus', 1]]}