question: When did Moody 's and Standard & Poor downgrade a significant number of IndyMac 's MBS bonds ?
answer: April 2008
turker_answer: Moody 's and Standard & Poor downgraded a significant number of IndyMac 's MBS bonds in April 2008 .
rule-based: Moody 's and Standard & Poor downgraded a significant number of IndyMac 's MBS bonds in April 2008 .