I want to know the answer to the following question:
Who was the U.S. Federal Reserve vice-chair in April 2009?
All the background I'm provided with is that "During April 2009, U.S. Federal Reserve vice-chair Janet Yellen discussed these paradoxes: "Once this massive credit crunch hit, it didn’t take long before we were in a recession.". Is that enough to answer the question?
Answer: yes