Question: How many former members from the band where Zack De La Rocha was a rapper/vocalist took part in the Audioslave discography?
{'answer': 'three', 'supporting_facts': [['Audioslave discography', 0], ['Audioslave discography', 1], ['Audioslave discography', 2], ['Audioslave discography', 3], ['Rage Against the Machine', 0], ['Rage Against the Machine', 1]]}