Question: Which Soviet mathematician was interrogated by the KGB as a result of his or her work, Sergei Novikov or Bella Subbotovskaya?
{'answer': 'Bella Abramovna Subbotovskaya', 'supporting_facts': [['Sergei Novikov (mathematician)', 0], ['Bella Subbotovskaya', 0], ['Bella Subbotovskaya', 3]]}