I am verifying the answers generated by an automatic system to the following question: how many seasons of grey's anatomy are there
Suggested answer: Dr. Preston Burke ( Isaiah Washington ) departs at the conclusion of the third season , and is replaced by Dr. Erica Hahn ( Brooke Smith ), who leaves the show during the fifth season , and later Dr. Teddy Altman ( Kim Raver ), who departs at the end of the eighth season .
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