<human>: Question: Who was the U.S. Federal Reserve vice-chair in April 2009?
Answer: 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 the question answered in a satisfactory fashion?

OPTIONS:
- yes
- no
<bot>: yes