Question: Fregattenkapitän Heinrich Lehmann-Willenbrock was a submarine commander in Germany during World War II and the subject of the mini-series called "Das Boot" when he was portrayed by which actor?
{'answer': 'Jürgen Prochnow', 'supporting_facts': [['Heinrich Lehmann-Willenbrock', 0], ['Heinrich Lehmann-Willenbrock', 4], ['Das Boot', 0]]}